Tsabo's Swarming

When Tsabo's Swarming enters the battlefield,
destroy up to one target non-Horror creature for
each Horror you control.
At the beginning of your end step, exile each
creature that was put into any player's graveyard
from the battlefield this turn. Then if you exiled
at least four Horrors this way, create a token
that's a copy of Tsabo's Swarming.