No Mystic Forge ?
Inventors' Fair ?
Wouldnt Bolas's Citadel be a great enabler for this kind of deck ?
You also have quite a bit of stuff to sac for phyrexian tower to ramp it up!
I kinda of hate how statuary is a non-bo with artifacts, it's so awkward, requires arts to enable it but can't cast arts with it, shit design imo
edit: no grafdigger's cage or weathered runestone in an artifact B01 centric deck is kinda sad
I have cage in the Karn board but the slots are too tight for it in the main, although Tormod's can generally stop a lot of shenanigans.
Citadel + Aetherflux Reservoir is ofc a cool combo but Citadel doesn't have synergy with PO. I've seen Mystic Forge in some PO sideboards but it's probably too expensive to main. PO doesn't need to cast from the top of the library because it can cast enough from hand to win. It's more an engine than a combo deck. You don't need to vomit out your entire library, the style and thrill of the deck is just having enough oomph to get the win. Expensive artifacts, that can't be improvised, just don't fit what the deck wants to do.
I am a little meh on Inventor's Fair, which I have experience running in PO back in the Arena beta. It was already a little too slow back then and Historic now is a lot faster than the environment back then. If I did run a colorless land (which would mean cutting Whirs) I would play Blasting Zone or Zhalfirin Void ahead of Inventor's Fair. I just don't think Inventor's Fair is worth including or wildcarding.
PO works with lots of cheap permanents, preferably 0-1 cost, but no more than 3 cost. It also works well with cheap planeswalkers (like Narset) and cheap enchantments, although enchantments can't improvise. Creatures just die these days, I will probably have to cut Sai as well.
- Instant and sorcery slots are tight.
- You need a cheap secondary card draw spell, (other than PO), which doesn't need set-up. In the beta this was Reverse Engineering, which strangely isn't currently in Arena, but Thirst for Knowledge works just as well if not better.
- You also need some countermagic/ interaction, so Memory Lapses and, for now, Brazen Borrower. I've seen Commit // Memory here, and both sides are useful, but I've found Commit is too slow and expensive.
- Whir is very, very good.
For the permanents-
0 cc- Basically just Tormod's Crypt, Ornithopter and Mox. Metalwork Colossus *can* be 0cc with some setup.
1 cc- There's some ok options but they are too often dead without PO or Inspired Statuary. Emry probably counts as 1cc here.
2 cc- The best options are Glass Casket, Mind Stone, Prophetic Prism and Silent Dart. Casket is removal on enters play, and the last two draw cards. Mind Stone is kind of strange. It's a ramping mana rock, and that's helpful, but the point of the deck is to be playing with moxes, not mana rocks. They can also draw engine with Emry, but I don't expect Emry to survive to get that going. Still, since they make actual mana (and not just improvise), they are pseudo 1cc. The Puzzleknots used to be good choices but I think they've been outclassed by Glass Casket.
3 cc- Not sure anything beats planeswalkers here. I've tried Mavinda here too but she takes too much setup.
4 cc- More planeswalkers, namely the two Karns.
Inspiring Statuary helping to cast your spells and planeswalkers is more than enough to justify 3 cmc. Still, sucks when it gets hit with removal:/