Murvar, The Hollow Mother

Murvar, the Hollow Mother enters the battlefield
with X +1/+1 counters, where X is equal to the
number of creature cards in your graveyard.
{1}, remove a +1/+1 counter from Murvar: create
a 1/1 black and green insect creature token.
{b}{g}, sacrifice an insect: draw a card and gain 1
life.