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.")
Nowhere else can one coin buy you a second chance.
![Coin of Mastery [Teenage Mutant Ninja Turtles Commander]](http://www.cardmerchanttakapuna.co.nz/cdn/shop/files/083b2e9a-b822-5f1f-9f2f-285bdec0d543.png?v=1776965770&width=1445)