flavorText: Nowhere else can one coin buy you a second chance.
name: Coin of Mastery
printings: TMC
text: 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.")
type: Artifact