4 Arcum Dagsson
3 Trinket Mage
3 Grand Architect
3 Trophy Mage
3 Sai, Master Thopterist

5 Tezzeret the Seeker

0 Mana Crypt
0 Mox Opal
0 Tormod's Crypt
0 Lotus Petal
1 Grafdigger's Cage
1 Expedition Map
1 Mana Vault
1 Pithing Needle
1 Skullclamp
1 Sol Ring
1 Aether Spellbomb
1 Sensei's Divining Top
2 Guardian Idol
2 Lightning Greaves
2 Winter Orb
2 Grim Monolith
2 Defense Grid
2 Thorn of Amethyst
3 Tangle Wire
3 Trinisphere
3 Thousand Year Elixir
3 Basalt Monolith
3 Rings of Brighthearth
3 Staff of Domination
5 Citanul Flute
5 Paradox Engine
7 Spine of Ish Sah

0 Hangarback Walker
0 Walking Ballista
0 Memnite
0 Ornithopter
2 Silver Myr
2 Plague Myr
2 Manakin
2 Millikin
2 Hedron Crawler
2 Spellskite
2 Phyrexian Revoker
2 Etherium Sculptor
2 Myr Retriever
2 Pili-Pala
3 Metalworker
3 Junk Diver
3 Skyscanner
4 Lodestone Golem

2 Copy Artifact
2 Artificer's Intuition
2 Power Artifact

2 Reshape
2 Transmute Artifact
3 Fabricate

0 Pact of Negation
2 Mana Drain
3 Whir of Invention

Mishra's Workshop
Strip Mine
Seat of the Synod
Darksteel Citadel
Inventor's Fair
Mishra's Factory
Inkmoth Nexus
Blinkmoth Nexus
Scalding Tarn
Flooded Strand
Polluted Delta
Misty Rainforest
Ancient Tomb
City of Traitors
Crystal Vein
Phyrexia's Core
Minamo, School at Water's Edge
Tolaria West
Academy Ruins
Buried Ruin
Hall of the Bandit Lord
Cavern of Souls

95 cards

I slotted Sai into the deck because the activated ability is serviceable and I realised it's bonkers with Clamp

One thing that has me semi-interested is Coveted Jewel and how strong it is if you can copy it. Sculpting Steel and Metamorph potentially become 0-mana Recalls if you have Jewel on the battlefield, and if you have cast Arcum only once then Echo Storm + Jewel nets you 1 mana and draws you 6 cards. The last few slots of the deck therefore could be something like Jewel + Sculpting Steel + Metamorph + Kuldotha Forgemaster

Otherwise cards on the shortlist include
- Quicksmith Spy
- Lion's Eye Diamond
- Retrofitter Foundry
- Gush / Reverse Engineer/ Thoughtcast / Thirst for Knowledge / Remora / M19 Tezzeret
- Voltaic Key
- Thought Prison (this is one of those cards I want to be good like Possessed Portal and Mindslaver but unfortunately it most likely just isn't)
- Static Orb / Sphere of Resistance