Festival 
Instant
$0.43 #24039 0.50 32.2 years
Cast this spell only during an opponent's upkeep.
Creatures can't attack this turn.
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Cards similar to Festival 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.
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+1 more matching line