Day of Black Sun {X}{B}{B}
Sorcery
Each creature with mana value X or less loses all abilities until end of turn. Destroy those creatures.
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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.