Meren of Clan Nel Toth:
Demon's Disciple is nice as another
Plaguecrafter effect.
Nullpriest of Oblivion is interesting, I'm very on the fence here.
Alesha, Who Smiles at Death:
Skyclave Apparition is the card I'm most excited for. Alesha has lacked a creature that can remove artifacts/enchantments permanently, and Apparition is fantastic. Even without a sac outlet, it's reusable and replaces the things it removes with small tokens, which aren't a problem at all. Such an awesome card.
Archon of Emeria &
Angel of Destiny are also options for Alesha, but they aren't 100%. Archon might draw too much ire from my playgroup & if Angel is more than ~$5, it probably won't be worth it.
I was really hoping some of the party cards would be playable as Alesha is a Warrior, but none of them stand out to me.
Kumena, Tyrant of Orazca:
Glasspool Mystic // Glasspool Shore is nice as a replacement for a land.
Thieving Skydiver has potential, but I am not in an artifact-heavy meta and don't have any open spots, so I'll probably decide against grabbing it.
Merfolk Windrobber is a solid option for a more combat-focused approach, but not my specific version.
Ezuri, Renegade Leader:
Tajuru Paragon is interesting, but likely not worth it.
Bala Ged Recovery // Bala Ged Sanctuary interests me. Seems like the perfect split card.
For all of them:
The fliplands are cool but not necessary for any of my decks, so I'll see how their price settles.
The mythic fliplands are cool (looking at the green one for Ezuri the most), as there is very little reason to not include them, but I doubt their prices will fall low enough to justify purchasing them.
I would love to hear everybody's opinions on the cards I listed I'm on the fence about & tell me if there's any that stand out to you that I missed!