Everlife Hydra

Undying (When this creature dies, if it had no
+1/+1 counters on it, return it to the battlefield under
its owner's control with a +1/+1 counter on it.)
Whenever Everlife Hydra enters the battlefield
or dies, you gain life equal to its power.
{3}{g}{g}, Remove a +1/+1 counter from Everlife
Hydra: You gain life equal to its power.