Hi there, I think your idea of focusing improvise on UB is nice, I personnaly run the
Grixis version and it never disapointed me so far except for colors sometimes, so here are my suggestions:
-Bastion Inventor 4X, hexproof is so sweet on this common, take out the syndicate trafikers, it has poor synergy when you want to cast things like the
demon and the inventor
-instead of metalspinner, play 4X the
cogworker's puzzleknot, provides two artifacts instead, if you play it, I suggest you also think about adding some
spire of industry for mana fixing and getting more value of the card
-metallic
rebuke is really powerfull when you can play a servo shematic turn 2, then a puzzleknot turn 3 keeping only one blue mana!
-key to the city is amazing for improvise, it adds so much CA in the late game and helped me win a lot of dragged matches
In the end, here are the changes i would make:
-3x
metalspinner's puzzleknot-2x
renegade freighter-2x
pacification array-4
syndicate trafficker-3
trophy mage which only tutors the freighter and nothing else, he would be better if you wanted to play a deck with
inspiring statuary,
dynavolt tower,
deadlock trap and so on!
+4x
bastion inventor+4x
cogworker's puzzleknot+4x
metallic rebuke+2
key to the cityThe four-ofs should also help make it more consistent! Btw if you want to play Tezzeret you might as well switch the skysovereign for a second copy