The Mourn-Raven

Sacrifice a non-token creature that hasn't died this turn: Return all creatures sacrificed by
The Mourn-Raven this turn from your graveyard to the battlefield.
Sacrifice The Mourn-Raven: Put a +1/+1 counter on all creatures that died this turn.
She mourns those who die, even when she is the one
who killed them. She sacrifices herself for those she kills, if only for them to hate her.