Reins of Power

Instant    (CMC:4)

Untap all creatures you control and all creatures target opponent controls. You and that opponent each gain control of all creatures the other controls until end of turn. Those creatures gain haste until end of turn.

103 C15 • ENColin MacNeil

™ & © 1993—2015 Wizards of the Coast

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

Oracle Text (click to copy):

Reins of Power {2}{U}{U} Instant Untap all creatures you control and all creatures target opponent controls. You and that opponent each gain control of all creatures the other controls until end of turn. Those creatures gain haste until end of turn.

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10/4/2004
It is perfectly legal for either or both players to have zero creatures. They give control of all their zero creatures as instructed.
5/1/2007
You only untap creatures controlled by you and the targeted opponent, not all creatures.

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