Tam, the Possibility (FRA-276) - Reality Fracture Foil

Planeswalker spells you cast cost 1 less to cast.

WUBRG, T: Proliferate X times, where X is the number of planeswalker types among planeswalkers you control. (To proliferate, choose any number of permanents and/or players, then give each another counter of each kind already there.)