You should include Fumble just because it matches the Deck title and artifact theme.

Stolen Identity and Replicating Ring

Thanks! These look fun. I do like that Fumble fits the theme, and it looks like a good way to add more removal and maybe steal an artifact or two as well.

If you're going for combat damage as a win condition, Rogue's Passage is a must. Also, how do your combos work? My brain isn't big enough to figure them all out.

Thanks, Rogue's Passage definitely looks useful for a giant Broodstar or Master of Etherium.

As for combos, the big one is probably Chakram Retriever + Emry, Lurker of the Loch or Emry, Lurker of the Loch + Mirran Spy . You can tap Emry to cast an artifact from your graveyard, then immediately untap her to do it again. With a 0-cost sacrificible artifact like Urza's Bauble, you can do this as much as you want, which triggers things like Sai, Master Thopterist and Efficient Construction every time the artifact comes into play. You can also sacrifice Ornithopter to Ashnod's Altar repeatedly this way for infinite mana. Foundry Inspector, Etherium Sculptor and Jhoira's Familiar make more of your artifacts cheap or free so you can recur them more. You can even make Solemn Simulacrum cheap enough this way to sacrifice it to Ashnod's Altar and cast it again with the mana you get, repeating for as much land and card draw as you want.

The deck doesn't rely on infinite combos or anything, and even a simple trick like Aether Spellbomb + Emry, Lurker of the Loch can let you bounce a troublesome creature at least once per turn. A lot of the stuff in here is maybe more just good synergy than true combos.