Cheapest priced copy (Dragons of Tarkir): $0.35 at Card Kingdom, near mint, their price list as of .
Lose Calm 
Sorcery · Common · Dragons of Tarkir · #147
Gain control of target creature until end of turn. Untap that creature. It gains haste and menace until end of turn. (A creature with menace can't be blocked except by two or more creatures.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dragons of Tarkir | 147 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 25 February 2015Gaining control of a creature doesn’t cause you to gain control of any Auras or Equipment attached to it.
- 25 February 2015Lose Calm can target any creature, including one that’s untapped or one you already control.