Unlicensed Disintegration or Anguished Unmaking?

Unlicensed Disintegration is definetely better than Anguished Unmaking.

I'd cut Saheeli. No reason to mess with blue mana for a 1-of. Might add Gonti's Aether Heart + Whirler Virtuoso. Those two plus either Decoction Module or Winding Constrictor (or 2x Decoction Module + Winding Constrictor, etc.) go infinite. Gonti's Aether Heart even gives you an extra turn to swing with all the dudes you just made. They both synergize well with the deck in general too. Overall, this looks like a really fun shell!

Though Whirler would necessitate blue mana haha

Oh, you don't have to sell me on Whirler Virtuoso. It's a really strong card if I have the other pieces, but it's generally weaker than Architect of the Untamed and Aethersphere Harvester. It's in the sideboard, but only because I want to make sure I'm in a slow enough matchup before I play it.

What you said about not messing with blue mana would usually be correct, but in all of my playtesting, I haven't really had any trouble casting any of my spells. If it ever does get too rough, though, I'll look into using Spire of Industry.

Gonti's Aether Heart certainly does go infinite with Virtuouso. Saheeli Rai is a little weird, but it costs 3 less mana than Heart does and the ult is a little cheeky for this deck in particular (though you'd probably only ever want to use the -2 ability). I'm currently looking in to testing Tezzeret the Schemer in her place, but Gonti's Aether Heart may make it's way into the sideboard with Whirler Virtuoso.

Thanks for the suggestions!