Great deck :D although here a few suggestions of some stuff I would personally swap,

Reya Dawnbringer great angel but 9 mana for a 4/6 that returns on card from the graveyard to the battlefield, for 9? negative I personally have chosen to not use Reya Dawnbringer in any of my decks for those reasons, I feel there are much better angels then her, that cost a hole lot less to cast, one is Baneslayer Angel personally I would swap Reya Dawnbringer for Baneslayer Angel

You are going heavy angels, so Urza's Incubator definitely would be a great card to add, I would remove Soulscour very nice boardwipe, however its very very expensive 10 mana expensive ._. thats expensive.

:) Great deck !

Thank you for the suggestions! I was planning on swapping out Reya Dawnbringer for Iona, Shield of Emeria at some point. I currently only have one Baneslayer Angel which I run in another deck. I've also considered Cloud Key which I find to be a more versatile option.

Thanks for the comment and ideas! I'll check out your stuff!

What about adding Cathars' Crusade and/or (preferably and) Glorious Anthem to pump all those angels you got. Also What about Mass Calcify because you only have white creatures right? I would only put Mass Calcify in only if you local meta has few mono white decks other than your own.

The only reason I don't run either of those pumps is I find Light from Within to be a more reliable pump answer. And for the reasons you mentioned, I don't run Mass Calcify as it doesn't help as often as a 4-drop generalized wipe. Thanks for the suggestions though!

Balance is banned from EDH :) i would suggest for that spotLuminarch Ascension.

It is true, Balance is banned, yet Restore Balance is not, even though they're identical in function; so it's moved to the sideboard just in case of a casual game. I also upped the ante and finally got Iona, Shield of Emeria and Linvala, Keeper of Silence in here, along with some added protection (Veilstone Amulet) and card draw (Slate of Ancestry).

I would really recommend Akroma's Memorial. Not only does it mesh with your theme, but makes Avacyn the baddest mother in existence. Also, Marble Diamond is a better mana rock than Pearl Medallion every day of the week. It gives you white. :)

I agree, Akroma's Memorial is a wall-buster, but it's just not quite the theme for this particular deck. I had to make an entirely different deck for Avacyn with an opposite mindset of this one. That one is Avacyn and The Shattering Heavens. That deck's focus is aggression, but this one is pacifistic and hangs back; it reacts and waits until one final moment. I have to respectfully disagree regarding the Pearl Medallion. If you ever cast more than one spell in any turn, it automatically starts to reduce costs for more than Marble Diamond can produce, and it does so without tapping. If I was in need of an additional artifact mana source I might add that, but at this point my most frequent issue is card draw and hand size, hence the recent addition of Slate of Ancestry. Thank you for your input though, I appreciate the thoughts and suggestions!

Nice build!

Have you given thought to Abeyance or Orim's Chant? Those would be my suggestions since you have some fun instants already

Thank you! I definitely want to get Orim's Chant, or at least the judge's foil promo.

Have to second previous comment on Urza's Incubator being worth a look. Also, I feel Land Tax is almost essential for any EDH deck running white.