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Interesting changes. In my experience with the new set, Teferi, Time Raveler makes it easy for opponents to combo off since only you can interact with them. Maybe you don't have to deal with infinite combos in your meta?
Have you considered 2 mana land tutors like Farseek , Nature's Lore , Three Visits , etc. instead of some of your artifacts? Tezzeret can untap artifacts which is nice but I prefer the consistency of land ramp.
Why Black Sun's Zenith over something simple like Damnation or Austere Command ? Does the indestructibility come into play? In that case I'd go with Hallowed Burial or Descend upon the Sinful unless you really want that shuffle effect.
Liliana, Dreadhorde General is great and has won me multiple games with her ult.