Mage Hunters' Onslaught {2}{B}{B}
Sorcery
Destroy target creature or planeswalker.
Whenever a creature blocks this turn, its controller loses 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.
Carnage Gladiator 87%
$0.05#19810
"Whenever a creature blocks, that creature's controller loses 1 life."
Baneblade Scoundrel // Baneclaw Marauder 80%
$0.14#26154
"Whenever a creature blocking this creature dies, that creature's controller loses 1 life."