Collective Restraint

Enchantment    (CMC:4)

Creatures can't attack you unless their controller pays for each creature attacking you, where X is the number of basic land types among lands you control. (This cost is paid as attackers are declared.)

49 IN • ENAlan Rabinowitz

™ & © 1993—2000 Wizards of the Coast

Legal in: Invasion Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

Collective Restraint {3}{U} Enchantment Domain — Creatures can't attack you unless their controller pays {X} for each creature he or she controls that's attacking you, where X is the number of basic land types among lands you control.

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View this MTG card on Gatherer

2/1/2007
In the Two-Headed Giant format, you still only have to pay once per creature.
2/1/2009
To determine the number of basic land types among lands you control, look at the lands you have on the battlefield and ask yourself whether the subtypes Plains, Island, Swamp, Mountain, and Forest appear within that group. The number of times you say yes (topping out at five) tells you how powerful your domain abilities will be.
2/1/2009
How many lands you control of a particular basic land type is irrelevant to a domain ability, as long as that number is greater than zero. As far as domain is concerned, ten Forests is the same as one Forest.
2/1/2009
A number of nonbasic lands have basic land types. Domain abilities don't count the number of lands you control -- they count the number of basic land types among lands you control, even if that means checking the same land twice. For example, if you control a Tundra, an Overgrown Tomb, and a Madblind Mountain, you'll have a Plains, Island, Swamp, Mountain, and Forest among the lands you control. Your domain abilities will be maxed out.
2/1/2014
Unless some effect explicitly says otherwise, a creature that can't attack you can still attack a planeswalker you control.

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Card Collective Restraint is not on TCGPlayer.