Mass Mutiny

For each opponent, gain control of up to one target creature that player controls until end of turn. Untap those creatures. They gain haste until end of turn.

"What say you, my most trusted advisors? . . . Advisors?"
—Edra, merfolk sovereign

Outlaws of Thunder Junction Commander

Explorers of Ixalan

Planechase Anthology

Commander 2013

Planechase 2012

For each opponent, gain control of target creature that player controls until end of turn. Untap those creatures. They gain haste until end of turn.

Gaining control of a creature doesn't cause you to gain control of any Auras or Equipment attached to it. However, if you gain control of a creature enchanted by an Aura with umbra armor and that creature would be destroyed that turn, instead the Aura will be destroyed and the creature will survive.

Mass Mutiny can target untapped creatures.

The phrase "up to one" was inadvertently omitted from Mass Mutiny's rules text. The card has received errata to correct this.

You can cast Mass Mutiny even if an opponent doesn't control any creatures. You simply won't choose a target for that opponent.