Karn, the Great Creator [War of the Spark Prerelease Promos]

Set: War of the Spark Prerelease Promos Type: Legendary Planeswalker — Karn Rarity: Rare Cost: {4} 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 each equal to its mana value.−2: You may reveal an artifact card you own from outside the game or choose a face-up artifact card you own in exile. Put that card into your hand.