Looks like a pretty solid deck...very similar to mine. What I found when playing mine was that the Seedguide Ash wasn't very useful. Yes, he does bring in 3 lands, but by the time you can cast a 5 drop with the Bannerets there are definitely better things to put on the field. I suggest either the Unstopable Ash or even a Cloudcrown Oak. Hope this helps a little.
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take out the Squadron Hawks and main board the Rest for the Weary. for the turbo life gain, its better and it doesn't mess with the mana curve at all. keep the firewalkers too. they are a MUST sideboard card for mono white
Overall its a really good deck. the only thing i can really think of is taking out all of the Elvish Harbingers and putting in 2 Proper Burials. it will cut the deck down to 62 cards and it will also allow you to gain ridiculous amounts of life. and also since it doesn't look like you're going to be casting anything really on the other person's turn i don't see the need for the Seedborn Muse. Not to mention most of your angels have vigilance along with the life gain you don't really need to worry about blocking. so if you take out the Seedborn Muses, you can add 1 more of each mana and make it a 60 card deck. hope this helped.
I suggest taking out the Kraken Hatchlings, Haunting Echoes, and the Esper Panoramas. instead run 2-3 more Nemesis of Reason, 2 Ravenous Traps, maybe 2 Memory Erosions(usually scares people from playing stuff), and 2-4 Terramorphic Expanses and you should be good.
yea they're 0/0, but if master of etherium is out then they stay in play. it turns them into 1/1