Windborn Muse {3}{W}
Creature — Spirit
Flying
Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.
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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.
Ghostly Prison 100%
$4.56#161
"Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."
Koskun Falls 100%
$15.68#10792
"Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."
Propaganda 100%
$2.03#115
"Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."
Collective Restraint 98%
$14.61#6738
"Creatures can't attack you unless their controller pays {X} for each creature they control that's attacking you, where X is the number of basic land types among lands you control."
Forbidding Spirit 83%
$0.16#15834
"When this creature enters, until your next turn, creatures can't attack you or planeswalkers you control unless their controller pays {2} for each of those creatures."
Akron Legionnaire 82%
#28174
"Except for creatures named this card and artifact creatures, creatures you control can't attack."
Lambholt Pacifist // Lambholt Butcher 82%
$0.21#23485
"This creature can't attack unless you control a creature with power 4 or greater."
Warden of the Chained 82%
$0.10#27889
"This creature can't attack unless you control another creature with power 4 or greater."
Arboria 81%
$0.30#17788
"Creatures can't attack a player unless that player cast a spell or put a nontoken permanent onto the battlefield during their last turn."
Summon: Yojimbo 81%
$1.48#2528
"Until your next turn, creatures can't attack you unless their controller pays {2} for each of those creatures."
Reclamation 80%
$0.62#27185
"Black creatures can't attack unless their controller sacrifices a land of their choice for each black creature they control that's attacking."
Overencumbered 80%
$0.34#10579
"At the beginning of combat on enchanted opponent's turn, that player may pay {1} for each artifact they control. If they don't, creatures can't attack this combat."
Mogg Toady 80%
$0.11#30572
"This creature can't attack unless you control more creatures than defending player."
Goblin Goon 80%
$0.35#20282
"This creature can't attack unless you control more creatures than defending player."