Baba Yaga's Apprentice

{2}{b}, Pay 2 life, {t}: Destroy target creature an
opponent controls. Then, place a 4/4 black
Zombie creature token onto the battlefield under
your control.
At the beginning of your upkeep, you may
sacrifice any number of creatures. If you do, you
may cast an Aura Curse with converted mana
cost less than or equal to the total power of the
sacrificed creatures without paying its mana cost.