Witherfang, Nature's Will

Wither, Lifelink
{b}{g}{r} and sacrifice a creature, draw a card and discard a card
{s}{s}{s}{r}, Witherfang deals damage equal to its
power to target creature or planeswalker.
Whenever another nontoken creature
or artifact enters the graveyard from
the battlefield put a +1/+1 counter
on Witherfang, Nature's Will.