Falter 

Instant
$0.11 #21498 0.06 27.9 years
Creatures without flying can't block this turn.
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Cards similar to Falter 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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Blinding Flare84%
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"Any number of target creatures can't block this turn."
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Hazardous Blast84%
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"this card deals 1 damage to each creature your opponents control. Creatures your opponents control can't block this turn."
Headliner Scarlett83%
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$0.16↑#12527↑0.50↑3.2 years↓
"Destroy target artifact or land. Creatures without flying can't block this turn."