Kazuki, Touched by Life

Lifelink, Trample, Flash, Deathtouch, Vigilance
Whenever a player plays an instant of sorcery
spell, you gain 3 life and this creature gains a
+1/+1 counter.
Ninjas you control have +X/+X, where X is this creatures power. Each upkeep, this creature gets
a +1/+1 counter.
{g}{g}{g}, {t}: Put X +1/+1 counters on this
creature. Where X is how much life you gained
this turn.