Nerzhul, The Relentless

Other zombies you control get +1/+1.
{2}{u/b}{u/b}: Exile target creature card from a graveyard. Create a token that's a copy of it, except it's a 2/2 black Zombie.
{3}{u/b}{u/b}, Sacrifice a creature: Return Nerzhul, The Relentless from your graveyard to the battlefield tapped. Activate this ability only
any time you could cast a sorcery.