Unwinding Clock

Artifact    (CMC:4)

Untap all artifacts you control during each other player's untap step.

"The partisans have unearthed a strange artifact. None know its origin, but it gives them hope of a life beyond."

164 NPH • ENMike Bierek

™ & © 1993—2011 Wizards of the Coast

Legal in: Modern,Extended,Scars of Mirrodin Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Unwinding Clock {4} Artifact Untap all artifacts you control during each other player's untap step.

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View this MTG card on Gatherer

6/1/2011
Those artifacts untap at the same time as the active player's permanents. You have no choice about what untaps and can't choose to not untap an artifact you control.
6/1/2011
Some effects, such as the one generated by Rust Tick's ability, state that an artifact doesn't untap during its controller's untap step. These effects won't apply and stop the artifact from untapping during another player's untap step.
6/1/2011
Even if you control more than one Unwinding Clock, you'll only untap your artifacts once during each other player's untap step.

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Card Unwinding Clock is not on TCGPlayer.