Karn, the Great Creator
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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.
Loyalty 5
Illustrated by Naochika Morishita
Rulings (6)
May 3, 2019
A noncreature permanent that turns into a creature can attack, and its 
abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn't matter how long the permanent has been a creature.
May 3, 2019
Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keyword abilities are activated abilities and will have colons in their reminder text, such as equip. Triggered abilities (starting with "when," "whenever," or "at") are unaffected by Karn.
May 3, 2019
If a permanent has 
in its mana cost, X is considered to be 0.
May 3, 2019
In a casual game, a card you choose from outside the game comes from your personal collection. In a tournament event, a card you choose from outside the game must come from your sideboard. You may look at your sideboard at any time.
May 3, 2019
Karn's first ability affects only artifacts on the battlefield. Activated abilities that work in other zones can still be activated.
May 3, 2019
Karn's last ability can't get a face-down card in exile, even if you know it's an artifact card.
