Guardians of the Forest

Whenever you cast a black creature spell, you
may put a copy of Guardians of the Forest onto
the battlefield.
Whenever a player deals damage by Guardians of
the Forest, you may return target black creature
card from your graveyard to the battlefield.
If Guardians of the Forest would die by battle,
you may sacrifice a creature. Return Guardians
of the Forest to the battlefield at the end of your
turn.