BloodCurse Angel

Flying, Decay (This creature deals and receives damage in the form of -1/-1 counters.)
Whenever a creature you control dies, put 2 -1/-1 counters on target creature.
Sacrifice three creatures: Return BloodCurse Angel from your graveyard to the battlefield.
"Death takes us all. There is no escape, only a desperate clinging to the hope of salvation."