Reins of Power
Price
Instant
Reins of Power
Mana
Oracle text
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.
Commander : legalModern : not legalPioneer : not legalStandard : not legalLegacy : legalVintage : legalPauper : not legal
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Official rulings (2) · Scryfall
2004-10-04
It is perfectly legal for either or both players to have zero creatures. They give control of all their zero creatures as instructed.
2007-05-01
You only untap creatures controlled by you and the targeted opponent, not all creatures.