I do not understand your recent update. Trading post is iffy, sure. But mystic forge? Your majority of your deck is artifact based. Perhaps I'm missing something?

Mystic forge + Sensei's Divining Top + cost reducer (Etherium Sculpter, Cloud Key/Semblance Anvil/Ugin, the Ineffable = Draw your whole deck. Each card is synergistic with the deck so it ensures no dead cards. Is top not considered due to you not wanting to spend $/budget? Even without top, forege is so powerful, can you elaborate why it was cut?

Instead of urzas command, why not add in another counterspell for interaction or draw to maintain gas (perhaps your commander is all the gas you need?).

Honestly I just can't recall Mystic Forge having made an impact for me so far, and the deck is quite good at drawing cards (or playing them from the graveyard) already. It does seem like it should be a bigger help here--maybe I've just been unlucky and never drawn it when it mattered so far. I could probably put that back in.

The Urza's Command is there mostly for the Construct token, to complement Broodstar, Master of Etherium, and Nettlecyst as a potential finisher. I still need to try this out to see how well it works.

As for the rest, it is mostly a matter of budget--I've been playing more Limited lately, so I'm more trying to use what I get right now rather than buying more singles. These all look very useful though, so I'll definitely keep your suggestions in mind.