Great card is great. Being in UW means you can both protect it in a proactive and reactive way, either by removing roadblocks or countering sweepers/edicts/etc either by literal countering or bounce spells. Gets stupid when you have equipment. I can understand not running him solely due to the fact that there are only so many UW slots and maybe you want to try something else, but I think Geist is easily top 3 UW.
UW is stacked right now. How does this compare with all the crazy new addition UW cards? I run GoST, Reflector mage, Soul Herder, Dovin Arbiter, Supreme Verict, Teferi HoD, Fractured Identity, Sphinx Rev. Think spell queller replaces this card?
UW is stacked right now, but I still think Geist is pretty competitive. It's currently on the outside looking in, but it could come back at any time. I play Fractured Identity, Supreme Verdict and both Teferis over it, but I think it competes relatively well in the #5 slot against all the other 3cc tempo options (Mage, Queller and Dovin; all of which are good).
I still play it and like it quite a bit. I would play Hero of Dominaria over it if I had one, but haven't made that financial plunge yet. I can also see it being a good # 4 if you don't want to run 2 planeswalkers in a guild.
There didn't seem to be a discussion thread for Geist of Saint Traft despite receiving glowing reviews in The Random Cube Card of the Day Thread so here it is.
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After that, there's a lot of cards with similar power level, including Geist of Saint Traft, Supreme Verdict, Celestial Colonnade, Dovin, Grand Arbiter and Teferi, Time Raveler. All of these cards have very different roles, however, so it's really about what you are trying to support and what you are looking for in this color.
360 card powered Chicago cube:
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2020 Numerical Power Rankings:
https://www.mtgsalvation.com/forums/the-game/the-cube-forum/cube-card-and-archetype/817969-2020-numerical-cube-power-rankings
2018 CubeTutor Power Rankings:
https://www.mtgsalvation.com/forums/the-game/the-cube-forum/cube-card-and-archetype/803301-cubetutor-power-rankings-2018-by-color-and-cmc