Coin of Mastery (Surge Foil) (TMC-038) - Commander: Teenage Mutant Ninja Turtles Foil
Each creature you control enters with an additional +1/+1 counter on it for each mana from an artifact source spent to cast it.
T: Create a Treasure token. (It's an artifact with "T, Sacrifice this token: Add one mana of any color.")
