Spymaster's Vault

Path of Ancestry seems out of place in a creatureless deck? Otawara, Soaring City lose colors but gain unique removal.

Grand Coliseum comes into play tapped? Breaking your own rules. How is this better than Reflecting Pool?

Tarnished Citadel the worst rainbow land? You are running all of the dual lands in a 3 color deck. Seems unnecessary.

Swan Song is superior but you now have access Strix Serenade too.

Vanishing Verse really solid 2 mana removal. Answers a lot of potential problems this strategy might encounter.

Deprive, Unwind and Rewind

Coiling Oracle

Flashback is very cool. Up there with Buyback.

Angel of Despair on theme targeted removal.

Rite of Oblivion the sorcery speed hurts but the targeted removal, sac outlet and flashback help.

My bad on Necrodominance. Anti-Null Brooch!

May I ask why such a hard no on Amphibian Downpour? This is cool design space. Humility is the global effect. Polymorphist's Jest is the silver bullet global effect. Amphibian Downpour is somewhere in between. You will always be playing it in response to a threat which gets neutered along with one other creature. That's the basic application. You run a bunch of 0, 1 and 2 mana spells a.k.a. perfect fodder for Storm debauchery. Or because of Flash in response to an opponents chain of spells.

Soul Echo > Helix Pinnacle perhaps? Something to ponder...

Flickering Ward and/or Whip Silk

Modern Horizons 3 gave you some potential new toys:

Amphibian Downpour mini Humility.

Necrodominance power at any cost.

Abstruse Appropriation removal theft.

You might not be a Legacy player but you sure do like utilizing Legacy deck building strategies in EDH.

Eviscerator's Insight > Deadly Dispute

Flare of Fortitude and/or Flare of Malice

Haha @ your maybe board. It is another deck!

Flickering Ward and/or Whip Silk are solid card drawing engines.

Unearth doesn't do enough in your list. Ill-Gotten Gains does serious work with Tergrid.

So Reanimate is better in the early game and allows you to utilize your opponents graveyard but it is bad deck building to rely on your opponents. The top of graveyard really bothers you, huh? I guess that's why WOTC did away with that wording. You are running an aristocrats strategy. YOU are in control of what ends up in the bin and when. Recurring Nightmare is banned for a reason. Corpse Dance is the next best thing.

Well you seem to like Legacy are you familiar with Shallow Grave? That's another Dark Ritual + Entomb sequence.

Ritual of the Machine less gimmicky

I know we don't align politically but take your "Magic has taken the direction of profit above all else. It will be the end of the game eventually. It always happens." and apply it to my concerns...

We now live in a Trust-free/Truth-free society. Can't call it a civilization because that implies civility. Since 9/11 it has been a slow march towards a police state. Tax-free churches guarantee the masses stay ignorant. Predators reap all the rewards while the rest of us pay for the sins of their past. Only stupid people are breeding a.k.a. narcissistic replication.

Nothing's Gonna Change

Nation's Gonna Collapse

No Good Cops

Dark Ritual into Entomb into Reanimate is OG Legacy. I get it... But this is EDH. Sure we have more life to play with but I don't think it is better. 1. Instant speed 2. Haste (in Orzhov!) 3. Deck has a sacrificing strategy which nullifies both "negatives" (the exile clause and what is on the top of your graveyard) 4. Forever in your hand

Vito, Fanatic of Aclazotz value

Blood Tribute/New Blood too gimmicky?

One last thing to chew on over the weekend:

Corpse Dance > Reanimate. You are a sacrifice deck. The restriction is nullified. Buyback also breaks one of the fundamental rules of the game. 5 is a lot more than 1 but it is reusable, no life loss and instant speed.

This is a really sweet angel aristocrats build!

Harsh Mercy > Wrath Of God perhaps?

Urborg Justice > Infernal Grasp perhaps?

Retraced Image do it ;)

Your Riptide Laboratory needs its PB&J in Snapcaster Mage.