Winged Words {2}{U}
Sorcery
This spell costs {1} less to cast if you control a creature with flying.
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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.
Gust of Wind 97%
$0.16#14147
"This spell costs {2} less to cast if you control a creature with flying."
Escaped Shapeshifter 81%
$1.09#29308
"As long as an opponent controls a creature with flying not named this card, this creature has flying. The same is true for first strike, trample, and protection from any color."