Death Charmer {2}{B}
Creature — Worm Mercenary
Whenever this creature deals combat damage to a creature, that creature's controller loses 2 life unless they pay {2}.
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Cards that do something similar 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.
Glass Asp 94%
$0.17#27109
"Whenever this creature deals combat damage to a player, that player loses 2 life at the beginning of their next draw step unless they pay {2} before that step."
Flayed Nim 91%
$0.14#24376
"Whenever this creature deals combat damage to a creature, that creature's controller loses that much life."
Nafs Asp 89%
$0.09#28687
"Whenever this creature deals damage to a player, that player loses 1 life at the beginning of their next draw step unless they pay {1} before that draw step."
Vicious Battlerager 88%
$0.16#11090
"Whenever this creature becomes blocked by a creature, that creature's controller loses 5 life."
Thrashing Mudspawn 87%
$0.11#28401
"Whenever this creature is dealt damage, you lose that much life."
Archfiend of Spite 86%
$0.80#8958
"Whenever a source an opponent controls deals damage to this creature, that source's controller loses that much life unless they sacrifice that many permanents of their choice."
Ashenmoor Liege 85%
$0.43#15977
"Whenever this creature becomes the target of a spell or ability an opponent controls, that player loses 4 life."
Emissary of Despair 84%
$0.14#20389
"Whenever this creature deals combat damage to a player, that player loses 1 life for each artifact they control."
Marionette Apprentice 82%
$0.83#560
"Whenever another creature or artifact you control is put into a graveyard from the battlefield, each opponent loses 1 life."
Vedalken Ghoul 82%
$0.21#27008
"Whenever this creature becomes blocked, defending player loses 4 life."
Keeper of Tresserhorn 81%
$0.64#31165
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life."
Lim-Dûl's Paladin 81%
$0.26#28541
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 4 life."