Elvish Spring of Life

When Elvish Spring of Life enters the battle field. put a +1/+1 counter on three target creatures you control.
Whenever a creature gains +1/+1 counters you gain that much life.
{g}{g} Target creature gains a +1/+1 counter.
On your endstep for each creature that has a +1/+1 counter on it gain that much life.