Gryffwing Cavalry 

Creature — Human Knight
Flying
Training (Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature.)
Whenever this creature attacks, you may pay {1}{W}. If you do, target attacking creature without flying gains flying until end of turn.
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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.
Skyline Scout 93%
$0.06#30907
"Whenever this creature attacks, you may pay {1}{W}. If you do, it gains flying until end of turn."
Order of the Golden Cricket 90%
$0.11#26150
"Whenever this creature attacks, you may pay {W}. If you do, it gains flying until end of turn."
Eddytrail Hawk 80%
$0.04#19477
"Whenever this creature attacks, you may pay {E}. If you do, another target attacking creature gains flying until end of turn."