Vigil of the Blind Eternities

Vigil of the Blind Eternities can be your commander.
Whenever you cast a noncreature spell, search your library for a creature card, then shuffle your library and put that card on top. If you can't, you lose the game.
"She left Ravnica with no destination. It's like she Planeswalked into a void."
-Ral Zarek, of Vraska