The Legion of Zol

At the beginning of your upkeep, create a 2/2
black Zombie creature token with haste.
{b}{b}: Sacrifice any number of Zombies you
control. Return target creature from a graveyard
to the battlefield under your control with
converted manacost X or less where X is the
number of Zombies you sacrificed. It is a black
Zombie in addition to its other types.