Keshna, Queen of the Swarm

Undergrowth - When Keshna, Queen of the
Swarm enters the battlefield, put X +1/+1
counters on up to 2 target creatures you control,
where X is the amount of creature cards in your
graveyard.
Whenever a creature enters your graveyard you
gain 1 life and your opponents lose 1 life.
When Keshna is put into a graveyard from any
where create X 2/2 black and green and black
insect creature tokens where X is the amount of
creatures in your graveyard.