Tezzeret, Fugitive Maker

+1: Untap an artifact you control. Reveal the top card of your library. put it into your hand if it is an artifact, and your graveyard if it is not.
-4: Put a petrification counter on two target creatures. They become 0/2 colorless artifacts with no abilities. Only you can attack with them.
-7: Until end of turn you gain control of all artifacts, they have Haste and are 3/3 Golem creatures. Create Gold token each time one dies this turn.