Tainted Remedy {2}{B}
Enchantment
If an opponent would gain life, that player loses that much life instead.
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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.
Plague Drone 100%
$2.01#6453
"If an opponent would gain life, that player loses that much life instead."