Moat {2}{W}{W}
Enchantment
Creatures without flying can't attack.
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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.
Lurking Green Dragon 82%
$0.21#22222
"This creature can't attack unless defending player controls a creature with flying."
Akron Legionnaire 81%
#28174
"Except for creatures named this card and artifact creatures, creatures you control can't attack."
Web of Inertia 81%
$0.75#11836
"At the beginning of combat on each opponent's turn, that player may exile a card from their graveyard. If the player doesn't, creatures they control can't attack you this turn."
Sandwurm Convergence 80%
$0.35#2271
"Creatures with flying can't attack you or planeswalkers you control."