Bloodletter of Aclazotz {1}{B}{B}{B}
Creature — Vampire Demon
Flying
If an opponent would lose life during your turn, they lose twice that much life instead. (Damage causes loss of life.)
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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.