Ephara

I mean curse of the swine is fairly poor against most things, as making creatures into smaller creatures is a bad proposition.
Most likely I could sideboard celestial flare. If green red is attacking with 2 dudes I'm probably losing anyway, and America control will rarely ahe multiple creatures.

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I played this a few more times, once vs UW which i won, and another vs orzhov control which I lost. Against UW, I won both games because I had two Brave the Elements in my hand. They would play Detention Sphere, I would play brave, they would Dissolve, and I would Brave again for the win. So perhaps 2-3 Gods Willing in SB to assure more protection. Aginst Orzhov, Blood Baron is a pretty big problem. Renounce the Guilds is AWESOME, and you should have 4 of them in SB. It also is wonderful vs Domri or Xena planeswalkers, and new multicolored Gods

Now for some constructive criticism. I like that the deck is good at keeping the field safe for Precinct and Brimaz. Attack, then prepare for removal. It allies control with aggro, which is hard to do and why you need to be more vigilant with it. I think this deck should be either more aggro or more control, but not both. If we consider turning more towards aggro theme, Dryad Militant is the weakest creature, especially since Snapcaster is out of rotation, and you need more turn 2 spells instead. Consider doing Spirit of the Labyrinth instead, as it is already seeing success in competitive top 8 decks. Other 2 drops worth considering: Deputy of Acquittals, Imposing Sovereign, and even Daring Skyjek because it can get past Sylvan Caryatid. Putting pressure on your opponent during first 3 turns is huge, otherwise if you don't have big things, opponent will eat you. If your opponent has bigger creatures or kills each of yours, this deck may not beat that. In the late game you may need random things. This is another reason to remove Dryad Militant; it is weak late game. Ephara is also rather weak late game. Heliod, God of the Sun is a great substitute, as it stays after board wipe, and is also another source of Vigilance. Heliod is also great for mirror decks. Definitely 4 Banisher Priests instead of 3, and lose 3-4 Detention Spheres, as well as losing some islands. You don't have time waiting for a plains or duel land if you're stuck. Aggro should mean that you don't have time to play Sphere, and same with Ephara. Two times I found myself not playing my Ephara on turn 4 because I wanted to play a creature to deal damage next turn instead. Instead, consider adding Ephara's Enlightenment. You can combo it with creatures entering the battlefield as well.
Finally, a random Elspeth, Sun's Champion in main deck may be needed for late game as well, and Ajani, Caller of the Pride is amazing with Precinct Captain for more aggro. Ajani is also scary after a supreme verdict.

If we're going for more control, consider doing more mono white theme with blue splash for azorius charm, Sphere, and maybe Ephara; Heliod still kind of seems better than Ephara. But I understand the point of this deck seems to be to make the best deck possible assuming Ephara is in mainboard, and drawing cards is super fun, so I don't know! The 3 Banisher priests is fine, but have a 4th one in sideboard if you're up against an aggro deck.

The reason you run dryad militant is because you need to have a 1 drop turn 1.
Ephara I don't find to be terribly weak as I can just keep drawing gas with, and d-sphere helps turn it on, I do agree about more two drops cutting jace, 1 archangel 1 land and a banished priest to get 4 skyjek. Not sure if cutting a priest is correct but it's more tempo then actual removal, so idk.

Heliod is bad in white wheenie actually as his ability is just super super super slow for it where drawing cards sells better.