Mad Auntie is arguably better than Goblin King, so you might want to throw a couple of those in.
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I don't understand the point of having the Terramorphic Expanses in this deck. Why not just have 4 more Mountains?
No, there's a problem with the program that lists each artifact land under both the "artifacts" category and the "land" category, but the problem doesn't extend to listing double the amount of them in the overall card count. If you were to actually count the cards in the list you'd find that there are 84 cards in the deck, which is untrue. There are only 4 of each artifact land card in the deck.
In that case I would suggest some Diabolic Tutors so that you can search you library for the cards you need, in case you don't have them in your hand. Also, countering everything the opponent plays until you can play a six-drop doesn't really sound feasible. I would say that you need some creatures, and Ravenous Rats and Cinderhaze Wretch are still looking good.
I advise some Stupors or Mind Rots in place of maybe Broken Ambitions or Mind Shatters. Ravenous Rats, Abyssal Specter, and Odylic Wraith are good if you want creatures, but the best in this deck would probably be Dimir Guildmage. Ancestral Recall can force them to draw cards, but if you're not into the boons then Braingeyser or Stroke of Genius can work. Consult the Necrosages could also work really well in this deck.
Alright, so I got rid of the Carnophage and Soultether Golems for some Devoted Caretakers and a couple of Goldenglow Moths. I also added in 4 Fabricates. I figure the moths are good early blockers while I'm waiting on either an Eon Hub or a Fabricate.
I would suggest Hold the Line instead of Righteousness, and you might want to consider Overrun as well. In general it looks as if creatures with trample would be your best bet if you just want to slam a facefull of damage down out of nowhere. That way even if they block you're getting most of your damage through. Defiant Elf is a good one, and Elvish Herder will allow you to give other creatures trample as well. Also, Ivory Mask does not go well with Goldenglow Moth.
This deck looks downright brutal.
As for artifacts with no mana cost, I put in some Welding Jars. I figure they have a place in here.
I considered putting Broodstar in, but I decided to just stick with the Myr theme (minus Mycosynth Golem, but at least it's an artifact). I understand that Broodstar would rule in this deck, but that makes me feel like it's turning into just another artifact deck, rather than specifically a Myr deck.
Gemstone Mine sounds good - I think I'll do that. I always have trouble finding suitable lands without playing a deck first. Are there any creatures that you find do not work with the deck? If so I'd like to remove them to clear up room for Devoted Caretaker and such.
Why not substitute 4 Seat of the Synod for 4 Islands?
I agree with gericault5; if you have more creatures with wither, it seems to me like the deck should do better. Maybe Noxious Hatchling instead of Woodlurker Mimic? Or maybe 2 and 2.
Yeah, Devoted Caretaker is a good card. I have Guardian Beast in there to protect Eon Hub, but without playing the deck I can't really tell how much protection is necessary.