Arrester's Zeal {W}
Instant
Target creature gets +2/+2 until end of turn.
Addendum — If you cast this spell during your main phase, that creature 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.
Thistledown Duo 89%
$0.09#30218
"Whenever you cast a blue spell, this creature gains flying until end of turn."
Mystic Skyfish 84%
$0.26#24362
"Whenever you draw your second card each turn, this creature gains flying until end of turn."
Urborg Scavengers 84%
$0.30#12363
"This creature has flying as long as a card exiled with it has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance."
Soulflayer 83%
$0.34#20150
"If a creature card with flying was exiled with this creature's delve ability, this creature has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, reach, trample, and vigilance."