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Karn, Scion of Urza
Legendary Planeswalker — Karn
[+1]: Reveal the top two cards of your library. An opponent chooses one of them. Put that card into your hand and exile the other with a silver counter on it. [−1]: Put a card you own with a silver counter on it from exile into your hand. [−2]: Create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control."