Zanletesh, the Thirteenth Pact

Flying
Whenever a nontoken creature you control dies, you lose 1 life and exile it instead, then create a 2/2 black Demon creature token with flying.
Other nontoken creatures you control get +3/+3.
"Ah Triskaidian, I've been waiting for you. Now what may I offer, most humbly, to the undying?"