Aether Exchange

Cast a creature spell with converted mana cost 2
or less of common or uncommon card rarity from outside the game without paying its mana cost.
Choose a creature you control. Search your library
for all creature cards and put them into a pile.
Choose a card at random from that pile and put it
onto the battlefield face down. ( You can't look at
it ) Shuffle the pile and the chosen creature into
your library. Turn the face down creature face up.
( This counts as that creature enterin