Tezzeret of Oblivion Bay

+1: Scry 1, then you may sacrifice an artifact. If you do, draw a card.
-2: Create a token copy of an artifact in your graveyard, except it's a 4/4 artifact creature in addition to its other types.
-6: Exile all artifact cards from your graveyard, then create an X/X artifact creature token, where X is the number of cards exiled this way.