Mist from Another World

Each player chooses five cards he or she owns from outside the game and exile them face down. For each card exiled this way, a player chosen at random manifests it. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn
it face up any time for its mana cost if it's a creature card.)
"This was a mistake." - Aravot, Inventor of Portal