Errant Wardruid

Haste, Spontaneous 2 (This creature enters
the battlefield with two +1/+1 counters on it. At
the beginning of your end step, remove a +1/+1 counter from this creature if able.)
Whenever Errant Wardruid is blocked, you
may put a +1/+1 counter on it. If you don't,
you gain 2 life.