Silencer
[wiki] rating: 2.0 (winrate: 54% pickrate: 15%)Clinkz
[wiki] rating: 1.6 (winrate: 52% pickrate: 9%)Keeper of the Light
* With 
Bloodthorn, Clinkz becomes a strong counter to heroes who rely on evasion and blind such as 
Windranger, 
Phantom Assassin, 
Troll Warlord and 
Keeper of the Light.
Kunkka
* Clinkz's high damage output and insane attack speed late-game can take Kunkka out of the fight before it begins.
* 
Burning Barrage and 
Searing Arrows together can kill allies easily even under Ghostship's buff.
* 
Skeleton Walk can allow Clinkz to make a quick escape after Kunkka's combo, or even avoid it all together.
Huskar
[wiki] rating: 1.6 (winrate: 52% pickrate: 5%)Keeper of the Light
* Vulnerable spellcasters with no escape mechanisms are easy targets for Huskar: 
Lich, 
Crystal Maiden, 
Silencer, Keeper of the Light, 
Venomancer, etc.
Kunkka
* Since Tidebringer has a 4 second cooldown, Kunkka has little availability to manfight Huskar.
Lifestealer
[wiki] rating: 1.6 (winrate: 50% pickrate: 9%)Keeper of the Light
* Heroes who have most or all their abilities (damage or disable) unable to pierce spell immunity: Keeper of the Light, 
Lina, 
Lion, 
Zeus.
Additional:
* 
Rage allows him to be immune to all of Ezalor's abilities. Also, the increased movement speed combined with the slow from 
Ghoul Frenzy and the squishy nature of Ezalor allows Lifestealer to take him down very quickly.
Kunkka
* Rage negates Kunkka's X Marks the Spot.
* As a strength hero with high strength gain and very little armor, as well as low agility gain, Kunkka is vulnerable to Lifestealer's 
Feast and 
Open Wounds.
Juggernaut
[wiki] rating: 1.4 (winrate: 50% pickrate: 17%)Kunkka
* 
Blade Fury negates Kunkka's X Marks the Spot.
* Kunkka has no way to dodge 
Omnislash.
* Kunkka has no way to hit 
Healing Ward directly in battle, and it mitigates Ghostship and Tidebringer's damage.
Keeper of the Light
* Juggernaut's Healing Ward keeps his team healthy even when pushing against Keeper of the Light's 
Illuminate.
* Blade Fury can dispel 
Blinding Light, as well as dodge an incoming Illuminate. Juggernaut can attack towers during Blade Fury, so he can dodge an Illuminate without having to stop pushing.
* Should Keeper of the Light obtain 
Will-o-Wisp through purchasing an 
Aghanim's Scepter, Juggernaut can make quick work of Ignis Fatuus without being interrupted by its pull.
* Keeper of the Light has low health, low armor, and no natural defense against Blade Fury.
Additional:
* Blade Fury allows him to be immune to all of Ezalor's abilities.
* Healing Ward heals his entire team, mitigating Ezalor's weak magical burst damage.
Keeper of the Light
* Keeper of the Light's Blinding Light makes Juggernaut miss his attacks. However, it can be dispelled easily with Blade Fury.
Omniknight
[wiki] rating: 1.0 (winrate: 55% pickrate: 4%)Kunkka
* 
Guardian Angel makes allies immune to all physical damage, effectively causing Tidebringer to do no damage.
* 
Purification is a powerful, pure damaging heal that can save Omniknight's allies after Kunkka's large damage.
Ursa
[wiki] rating: 1.0 (winrate: 52% pickrate: 11%)Kunkka
* Ursa's massive physical damage can destroy Kunkka quickly.
* 
Enrage can be activated before being hit by Ghostship to prevent most of the damage.
* 
Earthshock slows Kunkka's movement speed. With no escape abilities, Kunkka is easy prey.
Mirana
[wiki] rating: 1.0 (winrate: 52% pickrate: 15%)Kunkka
* 
Leap allows Mirana to easily escape Torrent and Ghostship.
Night Stalker
[wiki] rating: 1.0 (winrate: 50% pickrate: 6%)Keeper of the Light
* Keeper of the Light's Aghanim's Scepter upgrade loses much of its power, due to Night Stalker being able to reduce the duration of daytime by a lot.
Additional:
* 
Crippling Fear prevents Keeper of the Light from using his spells to keep his team alive during team-fights.
* 
Dark Ascension is very strong against Keeper of the Light, as it allows Night Stalker to jump the backline and quickly kill the squishy Ezalor, especially when combined with the slow from 
Void.
Outworld Destroyer
[wiki] rating: 1.0 (winrate: 50% pickrate: 9%)Kunkka
* 
Astral Imprisonment can allow Outworld Destroyer to save himself or allies from Kunkka's full kit.
* 
Sanity's Eclipse deal a large amount of damage, as Kunkka's mana pool is much smaller than Outworld Destroyer's.
* 
Arcane Orb deals pure damage, shredding through Kunkka and his team even with Ghostship's buff.
Sniper
[wiki] rating: 1.0 (winrate: 50% pickrate: 17%)Kunkka
* With his 
Take Aim, Sniper can simply sit out of your ability range and deal massive damage if not killed first.
* 
Assassinate can target allies who are still alive with low health because of Ghostship's buff.
* 
Headshot makes it harder for Kunkka to position/escape and makes it hard for Kunkka to hit with Tidebringer.
Phoenix
[wiki] rating: 1.0 (winrate: 49% pickrate: 5%)Kunkka
* 
Supernova negates Kunkka's combo entirely, as it can't be affected by spells while using Supernova.
* 
Icarus Dive also allows Phoenix to dodge Ghostship and Torrent.
Bloodseeker
[wiki] rating: 1.0 (winrate: 49% pickrate: 4%)Keeper of the Light
* 
Blood Rite makes Ezalor chose between getting off Illuminate or getting silenced for a while, as Illuminate is a channeled ability.
* Blood Rite's silence can completely take Ezalor out of a teamfight, as he relies on his abilities to be useful.
* Keeper of the Light's only mobility source, his high movement speed (via his high base movement speed and through spirit form), is entirely countered by 
Rupture.
Riki
[wiki] rating: 0.6 (winrate: 55% pickrate: 6%)Keeper of the Light
* Heroes with silences: 
Puck, 
Doom, 
Riki.
Nyx Assassin
[wiki] rating: 0.6 (winrate: 52% pickrate: 7%)Keeper of the Light
* Large area-of-effect with delay or require channeling: 
Enigma, Crystal Maiden, 
Invoker, 
Shadow Fiend, 
Pugna, Keeper of the Light
* The nature of some abilities turn them into an easy target for a turnover from Spiked Carapace:
* Slow-moving projectiles: 
Skywrath Mage, 
Tinker, 
Necrophos
* Large area-of-effect with delay or require channeling: Enigma, Crystal Maiden, Invoker, Shadow Fiend, Pugna, Keeper of the Light
* Deals damage over time: Venomancer, 
Huskar, 
Ember Spirit, 
Dark Seer, 
Sand King, Doom
Additional:
* 
Spiked Carapace can be used to reflect Illuminate damage and stun Keeper of the Light.
* 
Vendetta allows Nyx Assassin to follow Keeper of the Light around if he tries to split-push.
* Keeper of the Light is very squishy and will very quickly die to Vendetta and it's followup abilities.
* However, 
Mana Burn's Mana Burn can be more or less mitigated with Chakra Magic.
Treant Protector
[wiki] rating: 0.6 (winrate: 51% pickrate: 3%)Kunkka
* 
Treant Protector's 
Living Armor will also negate Tidebringer's damage.
Crystal Maiden
[wiki] rating: 0.6 (winrate: 51% pickrate: 18%)Keeper of the Light
* Heroes with channeling abilities: Enigma, 
Witch Doctor, Crystal Maiden.
Oracle
[wiki] rating: 0.6 (winrate: 50% pickrate: 4%)Keeper of the Light
* Heroes with dispels: 
Legion Commander, 
Oracle, 
Slark, 
Phantom Lancer
Tiny
[wiki] rating: 0.6 (winrate: 49% pickrate: 13%)Keeper of the Light
* Squishy heroes, usually supports, like Lion, 
Ancient Apparition, Keeper of the Light etc can die quickly to Tiny's magic burst.
Primal Beast
[wiki] rating: 0.6 (winrate: 49% pickrate: 9%)Keeper of the Light
* Any hero who lanes very poorly will struggle with Primal Beast's potential snowball in the very early levels, like Keeper of the Light, 
Luna, 
Templar Assassin...
Templar Assassin
[wiki] rating: 0.6 (winrate: 47% pickrate: 4%)Keeper of the Light
* Heroes that can jump and kill him: 
Meepo, 
Clinkz, Templar Assassin
Doom
[wiki] rating: 0.6 (winrate: 47% pickrate: 6%)Keeper of the Light
* Heroes with silences: Puck, Doom, Riki.
Puck
[wiki] rating: 0.6 (winrate: 47% pickrate: 7%)Keeper of the Light
* Low health spellcasters: Lina, Witch Doctor, Tinker, Keeper of the Light, all rely heavily on their spells and are fragile heroes. They all also have avoidable spells, allowing Puck to get to them and quickly burst them down.
Shadow Demon
[wiki] rating: 0.6 (winrate: 46% pickrate: 2%)Kunkka
* Similarly, they can negate your X Marks The Spot & Torrent combo by protecting your target when you use Return. Good candidates to negate your combo include 
Outworld Destroyer and his Astral Imprisonment, and 
Shadow Demon and his 
Disruption.
* Heroes with hide abilities can often dodge a Ghostship just before it hits.
* Similarly, they can negate your X Marks The Spot & Torrent combo by protecting your target when you use Return. Good candidates to negate your combo include Outworld Destroyer and his Astral Imprisonment, and Shadow Demon and his Disruption.
* A 
Eul's Scepter of Divinity can also do the trick, but, unlike the previously mentioned abilities, you can only use it on yourself and not your allies.
Legion Commander
[wiki] rating: 0.4 (winrate: 51% pickrate: 13%)Keeper of the Light
* 
Press the Attack can dispel Blinding Light or Solar Bind from a hero.
* 
Duel can be used to instantly take Keeper of the Light out of a team-fight.
Keeper of the Light
* Heroes with abilities that blind or cause Legion Commander to miss will prevent her from winning Duels: 
Arc Warden, Keeper of the Light, Riki, Tinker
Broodmother
[wiki] rating: -2.0 (winrate: 55% pickrate: 5%)Keeper of the Light
* Illuminate wipes out Broodmother's spiders and prevents her from pushing the lane. It also gives vision to reveal where broodmother is hiding in the trees.
Kunkka
* Kunkka's entire kit is great for taking out multiple units at once.
* Tidebringer's cleave will split through a wave of spiderlings.
* X Marks the Spot is great for dragging Broodmother back out of her web for Kunkka's team to set up on her.
* Torrent and Ghostship will demolish any spiderlings within the radius.
Additional:
* 
X Marks the Spot prevents Broodmother from escaping.
* 
Tidebringer can clear Broodmother's spiders if they get in range.
Faceless Void
[wiki] rating: -1.6 (winrate: 49% pickrate: 11%)Kunkka
* 
Ghostship can stun Faceless Void and give damage reduction to allies that are trapped during Chronosphere.
* 
Torrent can stun Faceless Void from outside Chronosphere.
* X Marks the Spot can bring back Faceless Void if he escapes using Time Walk.
* If the timing is right and there are allies to attack, combination of X Marks the Spot, Ghostship, Torrent and Tidebringer can kill Faceless Void instantly.
Keeper of the Light
* Any hero that can nullify effects of Chronosphere: (Keeper of the Light with Aghanim's Scepter during daytime, 
Winter Wyvern), banishing him or Faceless Void (Outworld Destroyer, Shadow Demon, 
Earth Spirit with Aghanim's Scepter) or protecting him in other ways (
Dazzle, Oracle, 
Abaddon) can greatly limit Chronosphere's potential.
Nature's Prophet
[wiki] rating: -1.2 (winrate: 44% pickrate: 4%)Kunkka
* Similarly, heroes with low cooldown teleports can be afraid to split push against X Marks the Spot, such as Tinker and 
Nature's Prophet.
* In general, highly mobile heroes like Earth Spirit or 
Storm Spirit are at a disadvantage against X Marks the Spot.
* Similarly, heroes with low cooldown teleports can be afraid to split push against X Marks the Spot, such as Tinker and Nature's Prophet.
Keeper of the Light
* Heroes that have AoE damage: Lina, Keeper of the Light, 
Timbersaw, 
Leshrac, 
Bristleback, 
Axe
Magnus
[wiki] rating: -1.2 (winrate: 50% pickrate: 11%)Keeper of the Light
* Any hero who can counter-initiate in anticipation without getting caught in Reverse Polarity: 
Sven, 
Omniknight, Enigma, Luna, 
Naga Siren, 
Mars, 
Jakiro, Venomancer, 
Elder Titan, 
Faceless Void, 
Rubick, Keeper of the Light, Pugna, Invoker, 
Spectre, 
Alchemist, Treant Protector, Lina, Oracle, Zeus, 
Shadow Shaman, 
Phoenix, 
Razor, Huskar, 
Batrider, 
Kunkka, 
Tidehunter, 
Wraith King, Sand King.
Kunkka
* Any hero who can counter-initiate in anticipation without getting caught in Reverse Polarity: Sven, Omniknight, Enigma, Luna, Naga Siren, Mars, Jakiro, Venomancer, Elder Titan, Faceless Void, Rubick, Keeper of the Light, Pugna, Invoker, Spectre, Alchemist, Treant Protector, Lina, Oracle, Zeus, Shadow Shaman, Phoenix, Razor, Huskar, Batrider, Kunkka, Tidehunter, Wraith King, Sand King.
Chen
[wiki] rating: -1.2 (winrate: 50% pickrate: 1%)Keeper of the Light
* Heroes with summons/illusions/neutral creep armies: 
Beastmaster, 
Chen, Naga Siren
Kunkka
* Heroes with cleave abilities and area of effect damage can make quick work of Chen's converted creeps and at same time gain farm: 
Magnus, Jakiro, Shadow Fiend, Kunkka, Luna, 
Dragon Knight, 
Medusa, Alchemist.
Monkey King
[wiki] rating: -1.0 (winrate: 45% pickrate: 9%)Keeper of the Light
* Blinding Light can knock Monkey King outside of his ultimate, Wukong's Command and can blind him.
* Will-O-Wisp will stun Monkey King from Tree Dance by destroying his tree.
Additional:
* Blinding Light can easily push Monkey King out of Wukong's Command, as well as blinding him.
* Monkey King is vulnerable to burst damage, 
Solar Bind makes him more so
* However, Keeper of the Light can be easily ganked by Monkey King during early-mid game stage.
Batrider
[wiki] rating: -1.0 (winrate: 46% pickrate: 2%)Kunkka
* X Marks the Spot breaks Flaming Lasso when used on ally and can break if used on Batrider.
Alchemist
[wiki] rating: -1.0 (winrate: 46% pickrate: 3%)Kunkka
* Tidebringer will deal lots of damage to Alchemist before he builds physical survivability items.
* Torrent and X Marks the Spot can control Alchemist at all stages of the game before he has Black King Bar.
* Ghostship's rum buff will greatly reduce the Alchemist's damage output in teamfights including his Radiance.
Chaos Knight
[wiki] rating: -1.0 (winrate: 47% pickrate: 4%)Kunkka
* Tidebringer, Torrent and Ghostship destroys Chaos Knight's 
Phantasm army all through the game.
Invoker
[wiki] rating: -1.0 (winrate: 48% pickrate: 15%)Kunkka
* Tidebringer pressures Invoker easily in lane due to Invoker's low health and armor in the early game.
Ember Spirit
[wiki] rating: -1.0 (winrate: 48% pickrate: 8%)Kunkka
* Using X Marks the spot Kunkka can prevent Ember Spirit from escaping with Activate Fire Remnant, until he purchase Eul's Scepter of Divinity or 
Linken's Sphere.
Sand King
[wiki] rating: -1.0 (winrate: 49% pickrate: 5%)Kunkka
* Ghostship helps your team soak up damage from 
Epicenter, especially if he initiates during the battle.
* Sand King can't dodge X Marks the Spot - Torrent combo by his abilities. Torrent drags him out of his 
Sand Storm
Beastmaster
[wiki] rating: -1.0 (winrate: 49% pickrate: 3%)Keeper of the Light
* Illuminate clears Beastmaster's summons and is effective against his push.
Spectre
[wiki] rating: -1.0 (winrate: 49% pickrate: 5%)Kunkka
* Spectre can't escape with 
Spectral Dagger under X Marks the Spot.
* Kunkka can dominate Spectre's lane using Tidebringer and gain an advantage.
* Ghostship helps your team soak up damage from 
Haunt.
Warlock
[wiki] rating: -1.0 (winrate: 50% pickrate: 5%)Kunkka
* Ghostship helps your team soak up damage from 
Chaotic Offering and hit summons hard.
* Tidebringer clears summons later in the game.
* Most of your spells can interrupt 
Upheaval.
Underlord
[wiki] rating: -1.0 (winrate: 50% pickrate: 3%)Kunkka
* X Marks the Spot will return Underlord or his teammate if they escape with Dark Rift.
Centaur Warrunner
[wiki] rating: -1.0 (winrate: 51% pickrate: 4%)Kunkka
* X Marks the Spot negates Stampede.
Lycan
[wiki] rating: -1.0 (winrate: 55% pickrate: 2%)Keeper of the Light
* Heroes with hastes: Dark Seer, 
Lycan
Keeper of the Light
* Keeper of the Light has a blind, which causes Lycan to miss his attacks.
Kunkka
* Tidebringer's cleave will cripple any of his summons.
* Could potentially build Heaven's Halberd to cripple Lycan even more.
Additional:
* Tidebringer can be used to kill Lycan's summons.
* Can also build into 
Heaven's Halberd which will disable Lycan's auto attacks, crippling him even more.
Wraith King
[wiki] rating: -0.6 (winrate: 46% pickrate: 4%)Keeper of the Light
* Heroes which rely exclusively on right clicks will struggle somewhat against Blinding Light: Phantom Assassin, Wraith King, Medusa
Terrorblade
[wiki] rating: -0.6 (winrate: 46% pickrate: 4%)Keeper of the Light
* Keeper of the Light can stall pushes with Illuminate. This makes him strong against pushing heroes: 
Terrorblade Naga siren Nature's Prophet and 
Anti-Mage
Medusa
[wiki] rating: -0.6 (winrate: 47% pickrate: 2%)Keeper of the Light
* Heroes with extremely slow movement speed will cripple against Solar Bind: Medusa, 
Viper
Additional:
* Will-O-Wisp will keep Medusa busy after she got hit by Blinding Light.
Earth Spirit
[wiki] rating: -0.6 (winrate: 47% pickrate: 4%)Kunkka
* In general, highly mobile heroes like Earth Spirit or Storm Spirit are at a disadvantage against X Marks the Spot.
* Similarly, heroes with low cooldown teleports can be afraid to split push against X Marks the Spot, such as Tinker and Nature's Prophet.
Mars
[wiki] rating: -0.6 (winrate: 47% pickrate: 12%)Kunkka
* Kunkka's Ghostship and Torrent disrupt fights in Arena Of Blood.
Pangolier
[wiki] rating: -0.6 (winrate: 48% pickrate: 11%)Keeper of the Light
* Certain heroes can mess up with Pangolier's positioning and timing (especially if he intends to use Rolling Thunder during combat): 
Vengeful Spirit, Keeper of the Light, Huskar, Dark Seer
Hoodwink
[wiki] rating: -0.6 (winrate: 48% pickrate: 12%)Kunkka
* Heroes that can negate Hoodwink's mobility: Kunkka, 
Disruptor, Mars.
Spirit Breaker
[wiki] rating: -0.6 (winrate: 49% pickrate: 9%)Keeper of the Light
* Heroes that punish mobile heroes: 
Bloodseeker, Keeper of the Light
Sven
[wiki] rating: -0.6 (winrate: 50% pickrate: 4%)Keeper of the Light
* Keeper of the Light's AoE blind can keep Sven from landing hits.
Zeus
[wiki] rating: -0.6 (winrate: 50% pickrate: 16%)Kunkka
* Heroes with long range abilities are also able to touch Zeus, such as 
Clockwerk, Kunkka, Puck, Skywrath Mage, 
Spirit Breaker, 
Tusk and others.
Disruptor
[wiki] rating: -0.6 (winrate: 50% pickrate: 12%)Kunkka
* X Marks the Spot is a counter to Disruptor's 
Glimpse, but you need quick reactions to pull it off.
Additional:
* X Marks The Spot allows Kunkka or his teammates to fight back under effect of Glimpse.
Marci
[wiki] rating: -0.6 (winrate: 51% pickrate: 17%)Kunkka
* Heroes that can keep Marci for a long time in one place so she can't pursue her targets, like 
Bane, Lion, Shadow Shaman, Invoker, Disruptor and Kunkka.
Naga Siren
[wiki] rating: -0.6 (winrate: 54% pickrate: 6%)Keeper of the Light
* Keeper of the Light can stall pushes with Illuminate. This makes him strong against pushing heroes: Terrorblade Naga siren Nature's Prophet and Anti-Mage
Tinker
[wiki] rating: -0.6 (winrate: 54% pickrate: 9%)Kunkka
* Similarly, heroes with low cooldown teleports can be afraid to split push against X Marks the Spot, such as Tinker and Nature's Prophet.
* In general, highly mobile heroes like Earth Spirit or Storm Spirit are at a disadvantage against X Marks the Spot.
* Similarly, heroes with low cooldown teleports can be afraid to split push against X Marks the Spot, such as Tinker and Nature's Prophet.
Additional:
* X Marks the Spot can be used to prevent Tinker from escape with 
Blink Dagger or 
Boots of Travel, discourage him from snapping farm and snapping gank. However, in later game, it'll be much more difficult because Tinker can buy 
Black King Bar or Linken's Sphere to prevent Kunkka from placing X on him, or Eul's Scepter of Divinity to prevent the recall
Visage
[wiki] rating: -0.6 (winrate: 56% pickrate: 5%)Kunkka
* Heroes with cleave or multi-target attacks can quickly take on Familiars and reduce Visage's firepower like 
Gyrocopter, Kunkka, Magnus and Medusa.
Queen of Pain
[wiki] rating: -0.4 (winrate: 46% pickrate: 7%)Keeper of the Light
* Heroes with teleports to escape Solar Blind and Will-O-Wisp: Phantom Assassin, Puck, 
Queen of Pain, Storm Spirit
Kunkka
* Ghostship helps your team soak up damage from 
Sonic Wave and 
Scream of Pain.
* Queen of Pain can't escape easily from X Marks the Spot - Torrent combo.
Dark Seer
[wiki] rating: -0.4 (winrate: 49% pickrate: 2%)Keeper of the Light
* Heroes with hastes: Dark Seer, Lycan
Kunkka
* X Marks the Spot prevents Dark Seer or his allies from escaping with Surge.
Phantom Lancer
[wiki] rating: -0.4 (winrate: 51% pickrate: 4%)Keeper of the Light
* Heroes with dispels: Legion Commander, Oracle, Slark, Phantom Lancer
Kunkka
* Tidebringer and Kunkka's AoE abilities in general are effective in clearing Phantom Lancer's illusions.
Additional:
* Tidebringer, Torrent and Ghostship destroys Phantom Lancer's illusion army.
* Phantom Lancer can't escape with 
Doppelganger under your X Marks the Spot, but can use it to dodge it.
Meepo
[wiki] rating: -0.4 (winrate: 52% pickrate: 1%)Keeper of the Light
* Heroes that can jump and kill him: Meepo, Clinkz, Templar Assassin
Kunkka
* X Marks the Spot is good to prevent a single meepo from escaping from a deadly situation.
* Tidebringer, Torrent and Ghostship destroys Meepo's clones.
Additional:
* Tidebringer's cleave damage can wear down Meepo's clones quickly. It can also give Meepo problems in the lane, due to his melee range and initially low health pool.
* Ghostship and Torrent can effectively disable Meepo while dealing heavy damage.
* X Marks the Spot prevents attempts to escape using Poof.
Enigma
[wiki] rating: -0.4 (winrate: 52% pickrate: 6%)Keeper of the Light
* Heroes with channeling abilities: Enigma, Witch Doctor, Crystal Maiden.
Keeper of the Light
* Illuminate can wipe the pushing Eidolons in a lane with ease, diminishing Enigma's laning presence by a lot.
* However, Keeper of the Light does not have any way to cancel Black Hole outside from Will-O-Wisp from Aghanim's Scepter.
Anti-Mage
[wiki] rating: -0.2 (winrate: 51% pickrate: 8%)Keeper of the Light
* Being an intelligence caster hero, Ezalor usually has a high mana pool and low health and armor, making him a prime target for 
Mana Void
* Ezalor's Illuminate damage and Solar Bind's magic resistance reduction are greatly reduced thanks to 
Counterspell. Counterspell can also block and reflect Solar Bind if timed properly.
* Anti-Mage usually is not hampered by Solar Bind or Will-O-Wisp thanks to 
Blink.
* However, despite all of this, if Keeper of the Light is played carefully and tops off his team's mana at all times, Anti Mage will not be able to get off a good Mana Void.
Keeper of the Light
* Keeper of the Light can stall pushes with Illuminate. This makes him strong against pushing heroes: Terrorblade Naga siren Nature's Prophet and Anti-Mage
Kunkka
* Kunkka can bring Anti-Mage back with X Marks the Spot, effectively negating Blink or forcing him to wait out the debuff before Blinking.
Phantom Assassin
[wiki] rating: 0.0 (winrate: 45% pickrate: 14%)Keeper of the Light
* Heroes with teleports to escape Solar Blind and Will-O-Wisp: Phantom Assassin, Puck, Queen of Pain, Storm Spirit
Keeper of the Light
* Heroes which rely exclusively on right clicks will struggle somewhat against Blinding Light: Phantom Assassin, Wraith King, Medusa
Lion
[wiki] rating: 0.0 (winrate: 46% pickrate: 12%)Keeper of the Light
* Mana Drain is very effective against heroes that have mana burn abilities such as Anti-Mage, 
Nyx Assassin and Keeper of the Light.
Kunkka
* Lion lacks mobility or escape mechanisms, making him an easy target for abilities like 
Mirana's 
Sacred Arrow or Leshrac's 
Split Earth, or combos like Kunkka's X Marks the Spot into Torrent.
Storm Spirit
[wiki] rating: 0.0 (winrate: 47% pickrate: 4%)Keeper of the Light
* Heroes with teleports to escape Solar Blind and Will-O-Wisp: Phantom Assassin, Puck, Queen of Pain, Storm Spirit
Kunkka
* In general, highly mobile heroes like Earth Spirit or Storm Spirit are at a disadvantage against X Marks the Spot.
* Similarly, heroes with low cooldown teleports can be afraid to split push against X Marks the Spot, such as Tinker and Nature's Prophet.
Viper
[wiki] rating: 0.0 (winrate: 47% pickrate: 4%)Kunkka
* Melee heroes with low mobility can be kited and killed by Viper: Treant Protector, Kunkka, Alchemist, Troll Warlord, Wraith King, 
Tiny, Sven.
Keeper of the Light
* Heroes with extremely slow movement speed will cripple against Solar Bind: Medusa, Viper
Witch Doctor
[wiki] rating: 0.0 (winrate: 49% pickrate: 14%)Keeper of the Light
* Heroes with channeling abilities: Enigma, Witch Doctor, Crystal Maiden.
Kunkka
* Heroes with long channeling abilities like Witch Doctor are easy targets for Kunkka to interrupt in team fights.
Additional:
* Torrent can cancel Death Ward from a far distance.
Slark
[wiki] rating: 0.0 (winrate: 52% pickrate: 14%)Keeper of the Light
* Heroes with dispels: Legion Commander, Oracle, Slark, Phantom Lancer
Keeper of the Light
* Melee carries during the laning phase: Sven, Slark
Kunkka
* Kunkka relies on his powerful AOE spells to turn the tides of teamfights. He cannot use them while silenced.
Last Word can mess up Kunkka's ability synergy, silencing him in the middle of his strong combo.
Global Silence can disable Kunkka's spell casting from anywhere on the map, even if Kunkka is spell immune at the time.
*
*
Keeper of the Light
* Being a cast-oriented hero, Ezalor will suffer from all of Silencer's abilities.
Global Silence is a guaranteed lengthy silence which will render Ezalor useless in a teamfight.
Arcane Curse and 
Last Word are good against any caster, since they are extremely potent.
*
*
* However, it should be worth mentioning that a smart Ezalor will buy Eul's Scepter of Divinity to dispel Silencer's abilities. Combined with the level 20 talent (Chakra Magic applies a basic dispel), Ezalor can purge Silencer's abilities off allies and himself alike.