Ice Floe

Land   

You may choose not to untap Ice Floe during your untap phase. : Tap target creature without flying that is attacking you. As long as Ice Floe remains tapped, that creature does not untap during its controller's untap phase.

IA • ENJeff A. Menges

™ & © 1993—1995 Wizards of the Coast

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

Oracle Text (click to copy):

Ice Floe Land You may choose not to untap Ice Floe during your untap step. {T}: Tap target creature without flying that's attacking you. It doesn't untap during its controller's untap step for as long as Ice Floe remains tapped.

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View this MTG card on Gatherer

10/1/2008
You may target a tapped creature with Ice Floe's activated ability.
10/1/2008
The targeted creature is not removed from combat. Its attack will continue as normal.
10/1/2008
If the ability resolves, then the creature gains flying later, Ice Floe's effect will not end. (The ability checks whether the creature has flying only at the time you activate it and the time it resolves.)
10/1/2008
If the affected creature is untapped by some other spell or ability, Ice Floe's effect will not end. If you keep Ice Floe tapped, and that creature becomes tapped again, Ice Floe will continue to prevent it from being untapped during its controller's untap step.
10/1/2008
Ice Floe doesn't track the creature's controller. If the affected creature changes controllers, Ice Floe will prevent it from being untapped during its new controller's untap step.
10/1/2008
If Ice Floe untaps or leaves the battlefield, its effect will end. This has no immediate visible affect on the creature. (It doesn't untap immediately, for example.) The creature will just untap as normal during its controller's next untap step.

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Card Ice Floe is not on TCGPlayer.