Deathdance Raven

Flying.
If a creature with a -1/-1 counter on would
die, exile it instead.
{1}{b}{b}, {t}: Put target creature card from a
graveyard onto the battlefield under your control
with a -1/-1 counter on it.
When Deathdance Raven leaves the battlefield
exile all creatures you control that have
any -1/-1 counters.