Quelaag, Daughter of Chaos

Menace.
{r}: Deal three damage to target creature or
planeswalker. Activate this ability only once
per turn.
Whenever a defending creature an opponent
controls dies, create a 0/1 black Humanity
creature token with "{t}, Sacrifice Humanity:
Create a +1/+1 counter on target creature you
control."
Once daughter of the Witch of Izalith, but now a
chaos demon.