Malign Ritual

When Malign Ritual enters the battlefield, put
the top six cards of your library into your
graveyard.
Whenever you gain life, you may pay {b} and exile
a creature card from a graveyard. If you do, create
a 1/1 white Spirit creature token with flying.
Sacrifice six Spirit tokens: Create a 5/5 black
Demon creature token with flying.