Akron Legionnaire {6}{W}{W}
Creature — Giant Soldier
Except for creatures named Akron Legionnaire and artifact creatures, creatures you control can't attack.
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Cards that do something similar expected a card that isn't here?
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Halls of Mist 84%
$3.40#19884
"Creatures that attacked during their controller's last turn can't attack."
Collective Restraint 84%
$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."
Web of Inertia 83%
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"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."
Felothar the Steadfast 83%
$2.83#4258
"Creatures you control can attack as though they didn't have defender."
Ghostly Prison 82%
$4.56#161
"Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."
Koskun Falls 82%
$15.68#10792
"Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."
Windborn Muse 82%
$0.72#1011
"Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."
Propaganda 82%
$2.03#115
"Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."
Overencumbered 81%
$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."
Nils, Discipline Enforcer 81%
$0.25#4012
"Each creature with one or more counters on it can't attack you or planeswalkers you control unless its controller pays {X}, where X is the number of counters on that creature."