I love that you made a version of this from our conversation the other week! This shell is promising, nice work! It's kinda like eldrazi tron, but instead of casting eldrazi you get more planeswalkers. 2 mana Though-knot is a little enticing. A few thoughts for direction of the build:

1.) I feel like we need more of the 4 mana karn's, and more to build around them, like more artifacts to make bigger constructs, and we need a tutor package that includes mycosynth lattice for the great creator.
2.) 6 mana ugin can also combo like KCI did. Scrap trawler, myr retriever, mox opal, and something grinding station is a K.O. combo. Maybe we can make a combo deck version that capitializes off this? The great creator can help with that as well. Sai, master thopterist is bang bang in that kind of deck, as is Tezzeret, master of the bridge. That deck also gets to run and loop spine of ish sah.