I'm very sympathetic to this. I had one too many narrow artifact support cards and since those cards were concentrated in UR it made it less natural to run artifacts outside that color combination. I may more drastically cut back on "artifact only" cards in the future to let people focus on adding an artifact dimension to other archetypes instead, which I find more interesting from a draft perspective. But to start I've just cut a few like
These were all fun cards that saw play, but they fit into too few decks, and resulted in way too many redundant pieces. I do really want to put Emry in, but since I play (and like) Sai, I feel I just don't have the space without exacerbating that same problem.
I've noticed the recent edits to your cube, and like what I've seen....definitely facing some similar issues in our respective cubes (shocker). I am surprised to see Aethermage being cut as it seemed quintessentially "mox cube".
Maybe both Engineer and Trading Post should go....
I've also taken a page out of Dom's book and added more Artifact aggro options - some colorless attackers and a small equipment suite. The equipment in particular has felt quite good - it really helps the aggro decks have a little extra play while providing natural artifact synergies. Again, this is less focused on an "artifact archetype" as such.
Artifact integration into aggro archetypes and to a lesser extent reanimator was a big revelation for my cube. Definitely cool to see you exploring that.
I've now gotten quite a bit of testing with Urza, and the card is busted. I think right now (if I'm drafting to win) it's at virtually the top of my pick order. Strong enough to pull me in a different direction halfway through pack two. It's generically good without combo elements, and with even a little bit of combo potential you get huge turns. Right now I wouldn't cut it because we're having a lot of fun exploring what the card can do in different combo shells... but I have a pretty distinct feeling he'll get the axe in a couple months. Kind of reminds me of Titania which I cut for similar reasons, but she stayed around for quite a while because we liked playing her.
Urza did give me some Titania vibes....a card I'm reluctantly trying again. I needed a straight forward way for the midrange lands matter decks to end the game. They were too often snails-paced, focusing on gaining incremental advantage. You can only end so many games on the back of recurred manlands and Loam-fed Zombie Infestation tokens. I'll have to think on Urza some more....I'm not sure the artifact decks need the same juice.