A few mana dorks might make the cut, and if you want to push that artifact theme you could always run Silver Myr, Copper Myr and Alloy Myr
4 Flynn Rider (His Own Biggest Fan) Discard The Cards, Gain The Lore
Commit is pretty nice as hard removal with all of your milling elements, even if the Memory half is pretty bad with your strategy
The front side of Valentin, Dean of the Vein is certainly a solid play in the first turn or two, but its the back side of the card, Lisette, Dean of the Root, thatll do a bunch of work for your deck, boosting all your creatures whenever you gain life, assuming you have the mana available
Play it early on and youll have a bit of healing at your command when you need it, helping to buy an extra turn to quest or challenge
Avacyn turns every permanent you control into a much harder problem to remove