Karn, Scion of Urza

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