Just adding some notes to detail some of the changes I recently made:
I removed Athreos and
Regna, The redeemer, and added
Mimic Vat and
Idyllic Tutor instead.
Ahtreos ended up not performing the way I thought he would. Most of the non-tokens in this deck are so significant that Athreos wasn't acting as a recursion tool, since everyone really wanted my creatures to hit my graveyard. So he was mostly draining people, and while this is nice, this isn't exactly what this deck aims to do (which is creating value engines).
Mimic Vat has the exact same mana cost as Athreos, and does what I wanted him to do: get more value out of my creatures. So far, this card has been crazy in this deck. Getting back your Elenda, or getting 4 tokens out of a
Grave Titan token in one turn is pretty absurd. On top of that, it synergizes with
Anointed procession for maximum shenanigans. This card performs well so far.
On top of that, most of the creatures in the deck are black, and since the token gets exiled at our end step anyway, we can simply sac it before it gets exiled to get a spirit out of our commander, which gives us more board presence and possibly more removal.
Regna was a hard card to cut. She really makes more sense in my
Teysa Karlov version of the deck, since she gives
lifelink to all tokens (and therefore Regna has an easier time triggering even if Krav gets removed). But with Ozhov Scion at the helm, the lifegain in the deck is minimal, and Krav is so good that he's essentially a removal magnet, so I had a few times where Regna chilled on the board doing pretty much nothing, and I want my 6 drops to have enough impact on their own to justify a place in the deck. So she got cut for
Idyllic Tutor, a good way to go get our best enchantments (and there are many of those in this list).
Currently possibly looking for a spot for either
Increasing Devotion (which was in my starting-budget-version of the deck, and this card performed really well so far) or
Sengir Autocrat for potential black sac fodder.