Gnawing Zombie {1}{B}
Creature — Zombie
{1}{B}, Sacrifice a creature: Target player loses 1 life and you gain 1 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.
Blight Keeper 90%
$0.17#16211
"{7}{B}, {T}, Sacrifice this creature: Target opponent loses 4 life and you gain 4 life."
Blood-Chin Fanatic 85%
$0.18#20793
"{1}{B}, Sacrifice another Warrior creature: Target player loses X life and you gain X life, where X is the sacrificed creature's power."