Dyfed, the Guiding Hand

[+1]: Create two tapped Powerstone tokens. (They're artifacts with "⟳: Add C. 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.