If you were to add any of the other cards (like you said, Yuatli, Phyrexian, Shalai, and Evra), which cards would you replace them with?

In all honesty there are a number of underperforming cards in the deck, even though it's pretty strong in my very casual playgroup. I could easily cut out cards like Voyaging Satyr (the deck only has 2 lands it does much with) and some of the other mana dorks and land-grabbing cards. On one hand, I can very consistently avoid mana issues, but on the other hand, it takes up a lot of deck space. It might have too much of a good thing.

Fortified Rampart, Grizzled Leotau, and Looming Altisaur are cheap options for high toughness, but they don't do much else. Of course, I like them because they become threats with Assault Formation or Belligerent Brontodon out, but that doesn't mean they can't be replaced by more powerful cards.

Soul Warden, Soul's Attendant, and Suture Priest are redundant, and could be good targets for replacement. You may notice that this deck has a ton of support for ETB lifegain, but not much for token generation. I could definitely stand to have more tokens and populate, which is why Phyrexian Processor or Soul Foundry (along with other token creators) could stand to take the place of some of the weaker or redundant lifegain cards. As it stands, Shanna, Sisay’s Legacy is consistently pretty weak because she doesn't have the token support she wants, and Trostani's populate doesn't always have a target, which isn't what I usually want from my commander.