Karn, Scion of Urza

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