This is a nice build. I's consider adding a Mirror-Mad Phantasm. The ability is great in a Bruna deck. I run it in my Bruna's Big Deck of Don't with very good results. Take a look at it. I've got some other neat things going on my the deck to you might want to borrow from. +1

Hey there, thanks for the suggestion! I had this on the initial list when I made this deck in prototype, and I found that self-mill doesn't achieve my goal as well in my metas; most decks I play with have easy graveyard hate (Tormod's Crypt, Scavenging Ooze, to name a few). It is too dangerous a strategy for me, but thank you! The most I might mill myself is with Jace, Memory Adept, and that's modest.

You need the new Sage's Reverie!

I like it! I haven't gone to any prereleases or FRF events so I only remember some vague online postings, haha. I do remember seeing that one, and definitely thought it over! Thanks!

Hey man, you don't have enough defensive enchants/creatures.

Here's some good ones.

Propaganda

Ghostly Prison

Windborn Muse

And one you can consider: Norn's Annex

I suggest the Annex because if they don't have white mana, then they have to take damage to attack you. Not as good, but still has it's uses.

Auras: Gift of Immortality // Steel of the Godhead // Unquestioned Authority // Spirit Mantle

Lands: Karakas // Kor Haven // Rogue's Passage

Guard Gomazoa or Fog Bank with Entangler (which I see you have) basically form a wall thats almost impossible to get over with combat, even better if you can give them indestructible or hexproof through stuff like Elgaud Shieldmate. I know your description says you don't ecesarily like to load up your graveyard, but Traumatize and Jace's Archivist can allow for some advantageous shenanigans.

Also, Sunbond forms an INSANE combo with Celestial Mantle.

Your suggestions certainly aren't bad--though I have rationale for auras I've removed from previous iterations of the list, like Steel of the Godhead. That one, in particular, doesn't do enough; I have a lot of ways to make Bruna unbeatable in combat (unblockable, first strike, etc). SotG is good, by all means, but I'd only use if for the unblockable. Same with Rogue's Passage, Unquestioned Authority, and Spirit Mantle. Karakas might be a future option, but is outside my comfort range for price.

I'm sorry for replying so late--I accidentally unsubscribed from my own deck.

Why do I see so many people recommending Karakas or putting it in their own EDH-lists? It's banned in commander!

why not enchanted evening?

Also steel of the godhead and shielded by faith

Enchanted Evening is in the current iteration of the deck, and is one of my favorite cards, however, it doesn't do much for the deck. Sure, I've gotten off combos of EE, Serra's Sanctum, Greater Auramancy, into a Sphinx's Revelation, but that's more gimmicky, when I could make the deck more efficient in terms of tutoring, drawing, and ramping. Steel of the Godhead doesn't do enough, and is also in the current deck. I have enough unblockability and lifelink is nice, but I have other ways of gaining or preserving life, and both the +1/+1 instances are outclassed. Shielded by Faith seems worthwhile. I'll put that in the maybeboard. :)

Very nice +1. Could you review and upvote my St Traft Azorius Duel?