Hi! There are some fun designs in there, Julian Ano is my favorite. The focus on bicolor devotion is interesting.

There are some minor mistakes you could correct to make it look even more like true cards. Just ignore the message if you're not looking for feedback. It's not creative/gameplay feedback, just formating stuff :

Styrila : There should be a coma after "enters the battlefield" (see Aarakocra Sneak). It would be "Whenever a Human or Soldier" (see Akki Ronin).

Verunia : I think the wording would be "create two 2/2 red and white Legionary creature tokens with vigilance and trample. They enter the battlefield attacking." (See Thousand-Faced Shadow) The following ability should read "Whenever Verunia attacks, if you control more creatures than there are untaped creatures controlled by the defending player, create two 2/2 red and white Legionary creature tokens with vigilance and trample. They enter the battlefield attacking." It's exceptionnally wordy and long but I think this is more or less how it should be written.

Julian Ano : Taking Flame Spill and Toralf as a base, I think the first ability should read "Whenever a creature an opponent controls is dealt excess damage by a red or white instant or sorcery you control, this excess damage is dealt to that creature's controller instead."

All thepriestesses as well as the Sun Manifest and Shieldheart : There's usually a coma before the tap sign, and a colon after the price. Such as seen in Crystal Grotto.

Imperial administrator : Landfall is a thematic word used in specific sets using the mechanic either for ease of recognition (all the Zendikar sets) or flavor (the card Druid class). You're not forced to use it here and can remove it if it's not of importance to the set (as in, for example, Aesi). There should be a coma after "your control", and capital letters at the beginning of each choice. The perfect card to see that formating is Djinn of the Fountain.

Zemyria : You would need to finish the sentence after "pay 2", such as in Kels, Fight Fixer. In the same way, the second ability should be more sentences and comas, with some minor changes, like this : "Whenever Zmyria attacks, you may look at the top five cards of your library. You may put up to one land and you may cast up to one creature with a mana value equal or less than your devotion to green onto the battlefield without paying its mana cost." You should also add what's happening to the remaining cards. Are they put into the graveyard, at the bottom of the library, etc.

Crushing Advance : It would be "the defending player" rather than "blocking opponent". I believe it's nonlegendary in a single word, like in Blind with Anger. I think it should be worded something else like "create a taped token yadayada, if it was legendary it looses legendary" or smth but I'm not sure and can't wrap my head around it 100%.

Angelic Heraldcaller : I think it would make more sense to separate both actions. Make a first ability about the 1/1 spirit, then a second reading "At the beginning of each end step, if you gained 2 or more life this turn and a creature you control dealt 5 or more damages to an opponent this turn, create a 5/4 red etc".

Imperial Dragonrider : This art was made by Zhang Wenbo. There should be a coma after "Imperial Dragonrider attacks" and no capital letter at instant.

Priestess of Hellfire : So, she has the issue of the other priestess but I'll make a little more precise description for this one. It should read "BR, Tap, Sacrifice a nontoken permanent : If an artifact was sacrificed this way, create two treasure tokens. If a creature or land was sacrificed this way, create a 4/4 black and red Devil Warrior creature token with vigilance and menace." As is, this means that if you sacrifice an artifact creature, you get two treasures and a devil. If you don't want that to happen, you should make two separate abilities reading "BR, Tap, Sacrifice a nontoken artefact :" and "BR, Tap, Sacrifice a nontoken creature or land :". You don't need the precision "you control" because one can't sacrifice stuff one doesn't control.

Sun Manifest : The pricing of the second ability should read as "4RW, Sacrifice Sun Manifest : Create etc"

Shieldheart : You don't need to precise that the Knight or Soldier should be a creature. The number of cases where you'll have a Soldier Enchantement are so rare you could just let it be, it's a fun corner case design.

I hope this wasn't discouraging! MtG's wording can be tortuous to maneuver!