Kaervek the Merciless 
Legendary Creature — Human Shaman
$0.29 #2693 0.80 20.0 years
Whenever an opponent casts a spell, Kaervek deals damage equal to that spell's mana value to any target.
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Cards similar to Kaervek the Merciless expected a card that isn't here?
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Parallectric Feedback80%
$0.33↑#26477↓0.00↓20.7 years
"this card deals damage to target spell's controller equal to that spell's mana value."
Imminent Doom76%
$0.13↓#25326↓0.21↓9.3 years↓
"Whenever you cast a spell with mana value equal to the number of doom counters on this enchantment, this enchantment deals that much damage to any target. Then put a doom counter on this enchantment."
The Lord of Pain76%
$10.66↑#24770.99↑2.1 years↓
"Whenever a player casts their first spell each turn, choose another target player. this card deals damage equal to that spell's mana value to the chosen player."
Screamer-Killer73%
$0.58↑#9885↓0.65↓4.0 years↓
"Whenever you cast a creature spell with mana value 5 or greater, this creature deals 5 damage to any target."
Kamahl, Pit Fighter72%
$0.20↓#18568↓0.13↓25.1 years↑
"
: this card deals 3 damage to any target."
: this card deals 3 damage to any target."
Rage Extractor72%
$0.16↓#30873↓0.16↓15.4 years↓
"Whenever you cast a spell with 
in its mana cost, this artifact deals damage equal to that spell's mana value to any target."
in its mana cost, this artifact deals damage equal to that spell's mana value to any target."
Magmatic Force72%
$0.38↑#10196↓0.40↓15.3 years↓
"At the beginning of each upkeep, this creature deals 3 damage to any target."
Knollspine Invocation71%
$0.37↑#30274↓0.07↓18.5 years↓
"
, Discard a card with mana value X: This enchantment deals X damage to any target."
, Discard a card with mana value X: This enchantment deals X damage to any target."
Aladdin's Ring71%
$0.26↓#24959↓0.19↓32.8 years↑
"
, : This artifact deals 4 damage to any target."
, : This artifact deals 4 damage to any target."
Dreamstalker Manticore70%
$0.12↓#26946↓0.12↓6.7 years↓
"Whenever you cast your first spell during each opponent's turn, this creature deals 1 damage to any target."
Torrent of Fire70%
$0.11↓#28719↓0.05↓23.4 years↑
"this card deals damage to any target equal to the greatest mana value among permanents you control."
Jeska, Warrior Adept70%
$3.54↑#19988↓0.00↓24.4 years↑
": this card deals 1 damage to any target."
: this card deals 1 damage to any target."
Viashino Heretic70%
$0.40↑#13527↓0.20↓27.7 years↑
"
, : Destroy target artifact. This creature deals damage to that artifact's controller equal to the artifact's mana value."
, : Destroy target artifact. This creature deals damage to that artifact's controller equal to the artifact's mana value."
Lozhan, Dragons' Legacy70%
$0.25↓#4373↓0.16↓4.4 years↓
"Whenever you cast an Adventure or Dragon spell, this card deals damage equal to that spell's mana value to any target that isn't a commander."
Embersmith70%
$0.13↓#29794↓0.06↓16.1 years↓
"Whenever you cast an artifact spell, you may pay . If you do, this creature deals 1 damage to any target."
. If you do, this creature deals 1 damage to any target."
Cunning Sparkmage70%
$0.36↑#10937↓0.29↓16.7 years↓
": This creature deals 1 damage to any target."
: This creature deals 1 damage to any target."
Vulshok Sorcerer70%
$0.15↓#13257↓0.19↓22.4 years↑
": This creature deals 1 damage to any target."
: This creature deals 1 damage to any target."
Viashino Fangtail70%
$0.15↓#24427↓0.00↓21.0 years
": This creature deals 1 damage to any target."
: This creature deals 1 damage to any target."
Prodigal Pyromancer70%
$0.09↓#11773↓0.06↓19.7 years
": This creature deals 1 damage to any target."
: This creature deals 1 damage to any target."
Erratic Explosion70%
$0.14↓#25152↓0.11↓24.0 years↑
"Choose any target. Reveal cards from the top of your library until you reveal a nonland card. this card deals damage equal to that card's mana value to that permanent or player. Put the revealed cards on the bottom of your library in any order."