Professor Ozpin

Professor Ozpin enters the battlefield with X reincarnation counters on him.
When Professor Ozpin enters the battlefield
search your library for up to X legendary creatures
with a converted mana cost of three or less and
put them into exile.
When Professor Ozpin dies, exile him, then you
may put a creature exiled with Professor Ozpin
onto the battlefield. This creatures name becomes Professor Ozpin and gains this ability.