You have a lot of artifact hate; do you need this much? It keeps a lot of things like Smuggler's Copter in check, but it feels a little arbitrary in a format with this many artifacts.
I dislike Ashnod on the grounds that she's very wordy in a disconnected way. Gorex, for example, is wordy, but the abilities make sense together. You don't seem to have brevity as a defining feature of your cube, but she's an outlier.
Lethal Scheme is a huge power outlier. It is difficult to overstate how absurd this card can be.
Village Rites >
Deadly Dispute? The latter makes an artifact that sacs...
Granulate seems weird to me in that it feels like it will be very polarizing and that there's not much artifact decks can do about it.
Gwenna is weirdly good. T1 Random Elf -> T2 Gwenna -> T3 Any Six-Drop seems really rough, especially given that Gwenna fixes.
Canopy Baloth is a really bad card unless your opponent has no creatures. It has keyword: Large, but I don't think it's especially interesting compared to the other things that four mana get you.
Tanuki Transplanter adds a lot of complication in one card. Might
Bear Umbra accomplish something similar?
Clay Champion was underwhelming in retail limited.
Sky Terror was always weird to me because flying and menace are just two different forms of evasion. The bulk of other fliers are in Blue, and most of them are tempo one-drops, so if you have them on the defensive I think you're doing well already.
Astor is a lot of words and I dont think you have any vehicles. (Edit: lots of vehicles now. He's fine, I just think he's inelegant. )
Perennial Behemoth is very expensive and makes you very vulnerable to removal for what it gives you.
Platoon Dispenser is a groan test benchmark for me.
Mechtitan Core is easy to disrupt and I think it's a trap. Maybe you have enough artifacts to trigger it early enough.
Nimblewright Schematic and the 2x
Servo Schematic feels weird to me, especially because you have no other duplicates.
Smuggler's Copter is a power outlier up. Probably the ideal p1p1 right now.
This is the ideal cube for
Slagstone Refinery and I'm still not sure it's good enough. Maybe you need something like
Makeshift Munitions to both use powerstones well and to get rid of them?
Anyways, looks great! Hope this was coherent/helpful.