Moira, Unveiler of Mystery

Skulk
Whenever a face-down creature you control is
turned face up, you may shuffle it into your
library, then reveal cards from the top of your
library until you reveal a card with morph and converted mana cost less than the creature's
converted mana cost. Put that card onto the battlefield, then put all other cards revealed this
way on the bottom of your library in a random
order.