Not only will Teferi be uncounterable, but so will your spells after as long as Teferi is in play
Petra Sphinx Petra Sphinx is the only mono-white sphinx in Magic, but its also the very first sphinx to see print all the way back in Legends
Ketramose, the New Dawn Ketramose brings a new type of exile matters synergy to Orzhov that definitely has a ton of potential
In terms of generic stuff there's definitely plenty you can do to up the power level: Vampiric Tutor, Demonic Tutor, and to a lesser extent Enlightened Tutor are super flexible mana efficient tutors that allow you to cut down on some of the deck's redundancy, so for example you can cut down on the weakest Curiosity cards (e.g
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I think the little caveat that it must attack eack turn is a funny drawback, but one that does not really diminish the power of DRC
