It's funny, I was helping someone with a deck very similar to yours earlier, and your deck has the same issue that his deck had.
My biggest issue with your deck is how you have a lot of one-off death triggers, but very few repeatable ones.
For example:
Afterlife creatures.
I know that's an unpopular opinion, but I don't like them except as a budget option. Once you kill a creature with
afterlife, it's
dead,
gone, unless you run reanimation. So eventually, if you don't have a way to generate tokens in a consistent way, your deck will run out of gas.
So my cuts would be:
Everything with
afterlife, period.
ligntning greaves (if you only have 1 card to protect your commander, it's not worth it, you won't see it in 80% of games).
Revival // Revenge (1st effect only brings back 1 creature once, 2nd effect is too expensive. Run any reanimation that can be reused, like
Phyrexian Reclamation, or
Hell's caretaker instead.)
Unbreakable Formation (why? It's a death trigger/aristocrat deck, let your stuff die, by all means).
Crested Sunmare (too expensive for what it does, Regna is just 100% better, and you already run her. Run
Bitterblossom instead).
Disciple of Bolas (again, one off effect, run
Dawn of Hope or
Dark Prophecy instead)
Hallowed Spiritkeeper (doesn't generate enough tokens, add
Hangarback Walker instead, or
Martial Coup since it also doubles as a board wipe)
Archon of Justice (you already run Orzhov Scion,
Grave Pact and Dictate, which do the same thing but better. Also very expensive, gotta watch that curve, you have 12 (Twelve!) cards at 5 CMC)
Blasting Station /
Darkest Hour, that's a very good combo when you have Orzhov Scion in the command zone, not so good as a part of the 99, since those 2 cards do almost nothing on their own. Easy cut.
Solemn Simulacrum (one off effect, there are much better draw engines with Teysa, see above with Agent of Bolas. Why not
Phyrexian Arena or
Mentor of the Meek instead?)
Stuff you need:
Hero of Bladehold (2 tokens, every turn)
Hangarback WalkerElspeth, Sun's champion (3 tokens, every turn)
Martial Coup (tokens, mana dump, board wipe)
Spawning Pit (sac outlet that creates tokens)
Requiem angel (allows you to sac tokens and create more tokens)
Twilight Drover (same as
requiem angel)