Karn of Mirrodin

+2: Target noncreature artifact you control becomes an artifact creature with power and toughness each equal to its converted mana cost.
-3: Return target artifact card with converted mana cost 3 or less from your graveyard to your hand. You lose life equal to its converted mana cost.
-10: Choose any number of permanents from outside the game, put them onto the battlefield. You gain life equal to the number of artifacts you control.