Queen of the undead

{b}{t}: Regenerate Queen of the undead
{b}{b}{t}: Sacrifice X creatures you control,
put X 1/1 zombie creature type tokens into
play.
Pay 1 life, {t}: Return a zombie type creature from your graveyard into play.
{b}{b}{b}{t}: Zombies you control gets +1/+1 until the end of turn.