Waldo

When Waldo enters the battlefield, exile all creatures face-down in a pile, shuffle that pile, then, starting with you, each player picks one at random and puts that card into play face down as a 2/2 creature under their control. At any time a player could cast a sorcery, that player may pay {3} to flip up one of these cards. If Waldo is flipped face up this way, its controller gains 10 life.