The Lord of Pain 
Legendary Creature — Human Assassin
$9.82 #2339 0.97 1.9 years
Menace
Your opponents can't gain life.
Whenever a player casts their first spell each turn, choose another target player. The Lord of Pain deals damage equal to that spell's mana value to the chosen player.
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Cards similar to The Lord of Pain expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
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+2 more matching lines
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Witch Hunt80%
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"Your opponents can't gain life."
Quakebringer80%
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"Your opponents can't gain life."
Archfiend of Despair80%
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Everlasting Torment79%
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"Players can't gain life."
Forsaken Wastes78%
$14.81↑#14335↓0.8729.9 years↑
"Players can't gain life."
Sunspine Lynx78%
$1.89↓#2813↓0.70↓2.1 years
"Players can't gain life."
Erebos, God of the Dead78%
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"Your opponents can't gain life."
Havoc Festival76%
$0.32↓#8441↓0.62↓13.9 years↑
"Players can't gain life."
Kaervek the Merciless76%
$0.31↓#25670.61↓19.9 years↑
"Whenever an opponent casts a spell, Kaervek deals damage equal to that spell's mana value to any target."
Atarka's Command76%
$1.14↓#6564↓0.27↓11.4 years↑
"• Your opponents can't gain life this turn."
+1 more matching line
Star Athlete74%
$0.91↓#4750↓0.15↓1.9 years
"Menace"
Parallectric Feedback72%
$0.35↓#26152↓0.21↓20.6 years↑
"this card deals damage to target spell's controller equal to that spell's mana value."
Breeches, the Blastmaker72%
$0.20↓#8224↓0.29↓2.4 years
"Menace"
Pyrostatic Pillar72%
$2.77↓#12176↓0.62↓23.3 years↑
"Whenever a player casts a spell with mana value 3 or less, this enchantment deals 2 damage to that player."