Crowley, King of Crossroads

Menance, Protection from Instants

Crossroad Pact —You can't lose the game and your opponents can't win.

Whenever a nontoken creature you control dies,
exile it and create a token that is a copy of that
creature except it is a demon in addition to its
other types.
If Crowley, King of the Crossroads dies or is exiled,
you lose the game.