Hitokuchi, the Steel Jaw

At the beginning of each end step, if you gained
life this turn, put two +1/+1 counters on
Hitokuchi and you may draw a card.
{2}{g}{w/b}, {t}: Create a number of X/X green
Mouth creature tokens with haste and lifelink,
where X is the number, rounded down, of +1/+1
counters on Hitokuchi divided by the number of
tokens created in this way. At the beginning of
the next end step, exile them.