Ice Floe
Land
You may choose not to untap Ice Floe during your untap step.
: 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.
Decks with Ice Floe
[5ED] Fifth Edition #420 (U)
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[ICE] Ice Age #355 (U)
[ME2] Masters Edition II #232 (U)