Rylara, the Eternal Guardian

Flying, Vigilance
Whenever a permanent you control enters the battlefield, you may search your library for a permanent card with converted mana cost equal
to or less than that permanent's converted mana
cost, put it onto the battlefield, then shuffle your library.
Whenever a permanent card you control is put
into a graveyard from the battlefield, you may
exile it. If you do, create a 1/1 white Spirit
creature token with flying.