Scarlet Aeonia

Sacrifice a creature. Put X -1/-1 counters on all
creatures, where X equals the sacrificed
creature’s power.

Litany {8}{b}{r}, 4 Faith. (When this spell resolves, exile it. You may cast this spell from
exile for its Litany cost. If you do, tap creatures with Faith counters on them and remove the required number of counters from them.)
When you Litany Scarlet Aeonia, you win
the game.