Elesee, Drowning Enlightenment

Flash
Whenever you gain life exile a creature you
control. Put X time counters on it where X is the
number of life you gained. At the beginning of
each endstep remove a time counter. If there are
no time counters on it, return it to the battlefield
with 3 +1/+1 counters. It gains indestructible
until end of turn.