The costume's original coin price was 1,000, but the game makers changed it to 10 coins to help all players unlock it faster. The price is known because the costume used to be available in the Wardrobe from a glitch during 6.0.1 (beta) update.
The Green Minion is a disguise taken from the Grinch movie by Universal Pictures.
Green was one of the costumes that never appeared in the previous version. Its cards became available during the Movie Night: The Grinch special mission and they were limited to a total of 77.
After the special mission ended, a special time-limited bundle offer gave another 5 Green cards including tokens and coins.
The costume's powers are second best to this category, the best so far being Lab Coat's (500% more Despicable Actions), and the third best is Partier (100% more).