Witch of the Forbidden Forest

At the beginning of your end step if you sacrificed
another creature, put a -1 -1 counter on another
target creature, then lose 2 life.
Whenever a creature an opponent controls
becomes the target of a spell or ability you
control, you may put a hex counter on a creature
you control.
{g}{b}, {t}: Sacrifice a creature with a hex counter
on it. If you do, draw cards equal to that creature's
power and gain life equal to its toughness.