Xeonin, Wandering Proidigy

First strike
{b}{r}, Sacrifice another creature: Xeonin,
Wandering Prodigy gets +2/+0 and gains
Deathtouch until end of turn.
At the beginning of each end step, if a creature
damaged by Xeonin, Wandering Prodigy this turn
died, Transform Xeonin, wandering prodigy.