Karn, el Gran Creador

Text:

Rulings:

• 5/3/2019 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.
• 5/3/2019 Karn’s first ability affects only artifacts on the battlefield. Activated abilities that work in other zones can still be activated.
• 5/3/2019 A noncreature permanent that turns into a creature can attack, and its <img src="/Handlers/Image.ashx?size=small&amp;name=tap&amp;type=symbol" alt="Tap" align="absbottom" /> 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.
• 5/3/2019 If a permanent has <img src="/Handlers/Image.ashx?size=small&amp;name=X&amp;type=symbol" alt="Variable Colorless" align="absbottom" /> in its mana cost, X is considered to be 0.
• 5/3/2019 Karn’s last ability can’t get a face-down card in exile, even if you know it’s an artifact card.
• 5/3/2019 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.