Karn, Resurgent Liberator

+2: Put a silver counter on each of up to two target non-Karn permanents. Those permanents are artifacts in addition to their other types. Scry 2.
0: Sacrifice one or more noncreature artifacts. When you do, put that many loyalty counters on Karn and create two 1/1 colorless Myr creature tokens
-12: Exile all artifacts.