Cheapest priced copy (Explorers of Ixalan): $0.79 at Card Kingdom, near mint, their price list as of .
Mass Mutiny 
Sorcery · Rare · Outlaws of Thunder Junction Commander · #174
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.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
5 printings · $0.79 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2013 | 116 | Rare | $0.99 | — |
| Explorers of Ixalan | 27 | Rare | $0.79 | — |
| Outlaws of Thunder Junction Commander | 174 | Rare | $0.79 | — |
| Planechase 2012 | 48 | Rare | $0.99 | — |
| Planechase Anthology | 48 | Rare | $0.79 | — |
4 rulings from Wizards of the Coast
- 1 June 2012Gaining 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.
- 1 June 2012The phrase "up to one" was inadvertently omitted from Mass Mutiny's rules text. The card has received errata to correct this.
- 1 June 2012You can cast Mass Mutiny even if an opponent doesn't control any creatures. You simply won't choose a target for that opponent.
- 1 June 2012Mass Mutiny can target untapped creatures.