Gisa, Wraithwaker

{t}: Zombie creatures you control get +1/+1 until
end of turn.
{b}, {t}, Sacrifice a Zombie: Return target creature
card from your graveyard to your hand.
{b}{b}{b}, {t}, Sacrifice ten Zombies: Destroy all
non-Zombie creatures, then return all creature
cards from all graveyards to the battlefield under
your control.