Ugin, the Ur-Walker

+2: Create an indestructible hedron artifact token.
It has, "{t}: Exile a spell or emblem. This token
doesn't {ut} for as long as it is under your control."
0: Sacrifice any number of hedron artifact tokens
you control. Add {c}{c} to your mana pool for each
token sacrificed this way.
-12: You get an emblem with, "You may cast
spells from exile" and "You may use mana of any
type to cast spells."