Forbidding Spirit {1}{W}{W}
Creature — Spirit Cleric
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.
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Cards that do something similar expected a card that isn't here?
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Orcish Conscripts 84%
#30294
"This creature can't attack unless at least two other creatures attack."
Web of Inertia 83%
$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."
Collective Restraint 83%
$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."
Ghostly Prison 83%
$4.56#161
"Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."
Koskun Falls 83%
$15.68#10792
"Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."
Windborn Muse 83%
$0.72#1011
"Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."
Propaganda 83%
$2.03#115
"Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."
Harbor Serpent 81%
$0.14#20206
"This creature can't attack unless there are five or more Islands on the battlefield."
Champions of Minas Tirith 81%
$0.32#5273
"At the beginning of combat on each opponent's turn, if you're the monarch, that opponent may pay {X}, where X is the number of cards in their hand. If they don't, they can't attack you this combat."
Elephant Grass 81%
$3.73#10132
"Nonblack creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."
Reclamation 81%
$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."
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."
Warden of the Chained 80%
$0.10#27889
"This creature can't attack unless you control another creature with power 4 or greater."
Lambholt Pacifist // Lambholt Butcher 80%
$0.21#23485
"This creature can't attack unless you control a creature with power 4 or greater."
Mogg Toady 80%
$0.11#30572
"This creature can't attack unless you control more creatures than defending player."