Altar of Gor-kuul

{t}, Sacrifice a creature: Put a soul counter
on Altar of Gor-kuul.
{t}, Exile Altar of Gor-kuul: Create an X/X black Demon creature token with flying and trample, then each other creature gets
-X/-X until end of turn, where X is equal
to the number of soul counters on Altar of
Gor-kuul.