Karn, the Great Creator [Prerelease Cards - 1]

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Legendary Planeswalker — Karn

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.