Hukagan, Who Never Dies

Flying, lifelink
When you gain life, if Hukagan, Who Never Dies dealt damage this turn, put a +1/+1 counter on target creature equal to the amount of life gain this turn.
When Hukagan dies, exile with X time counters on it, where X is the difference between your starting life total and you current life total.
When you gain life, if Hukagan is exiled, remove time counters from it equal to the amount of life you gained.