Sram's Expertise instead of the copter.
Also, if this is a modern deck, you have SUCH better removal available to you other than welding sparks. Bolt, Path to Exile... I would strongly recommend removing some of the various anthem effects. Jor Kadeen, the Prevailer - you're only playing 20 land. You probably should be very close to GG by the time he drops, if you manage to drop him at all. Again, a plethora of great cards could replace this.
FInally, this is an agressive strategy. The last thing you want to do later in the game is draw a Boros Signet. i really don't why you would have here. If you want to increase the artifact count - make it a cheap aggressive artifact!
P.S, the only creatures Chief of the Foundry are pumping at the moment are themselves when there are two or more on the board, and the servos you produce from the puzzleknot. I don't think it warrants the place.