Sellen, Exiled Emissary

Lifelink
Whenever you gain life, you may exile target creature
card from a graveyard. If you do, create a 1/1 white
and black Spirit creature token with lifelink.
{b}, Sacrifice another creature: Return target creature
card exiled with Sellen, Exiled Emissary to the battlefield under your control.
"Cast out from the temple's halls, I walk the
shadowed path, seeking redemption in the embrace of the darkness."