Gnat Alley Creeper 

Creature — Human Rogue
$0.04 #31913 0.44 20.3 years
This creature can't be blocked by creatures with flying.
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Cards similar to Gnat Alley Creeper 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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"Creatures with flying can block only creatures with flying."
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"Creatures with flying don't untap during their controllers' untap steps."