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Reins of Power

Card Name

Reins of Power

Mana Cost

2

Type

Instant

Rarity

Rare

rules Text

You and target opponent each untap and gain control of all creatures the other controls until end of turn. Those creatures are unaffected by summoning sickness this turn.

Legal Formats

Commander, Legacy, Vintage

Not Legal Formats

Alchemy, Brawl, Explorer, Historic, Modern, Pauper, Pioneer, Standard

Rulings

(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.