Agnor, the Forgotten Death

Flying, vigilance.
At the beginning of combat of your turn, create a
1/1 black spirit creature token with first strike.
Then target creature gets -X/-X until end of turn, where X is the number of spirits you control.
Morbid — For as long as a creature has died this
turn, you may cast Agnor, the forgotten death
from your graveyard or exile.