Vellia Nix, Death's Awakening

Flying, deathtouch
Deathshift {b/g}{b/g}{b/g}.(Whenever a creature dies,
if this creature is in your graveyard, you may
pay {b/g}{b/g}{b/g}, if you do, return this creature to the
battlefield.)
Spirits, Zombies and Skeletons in your graveyard
have Deathshift {b/g}{b/g}{b/g}.