Karn, the Great Creator - War of the Spark - #001/264

Activated abilities of artifacts your opponents control can’t be activated.
[+1]: Until your next turn, up to one target noncreature artifact becomes an artifact creature with power and toughness equal to its converted mana cost.
[-2]: You may choose an artifact card you own from outside the game or in exile, reveal that card, and put it into your hand.