Dyfed, the Guiding Hand — Mystery Booster Commander Edition #7

+1: Create two tapped Powerstone tokens. (They're artifacts with ": Add . This mana can't be spent to cast a nonartifact spell.")

−X: Untap X target artifacts.

−6: Search your library for an artifact card, put it onto the battlefield, then shuffle.

Dyfed, the Guiding Hand can be your commander.