Carmilla, Demonic Usurper

Flying, wither, lifelink
When Camilla, Demonic Usurper transforms,
Put a -1/-1 counter on all creatures your
opponents control.
Whenever a creature an opponent controls with a
-1/-1 counter on it dies, you may return that card
to the battlefield under your control.
{p/b}, Sacrifice another black creature: Carmilla
deals 3 damage to target creature.