No Mercy {2}{B}{B}
Enchantment
Whenever a creature deals damage to you, destroy it.
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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.
Death Pits of Rath 91%
#18548
"Whenever a creature is dealt damage, destroy it. It can't be regenerated."