I'd put 4 mutavaults, get up to 4 Preeminent Captains, 4 honor of the pures, and 4 path to exile. Brave the Elements, and maybe get rid of coat of arms in favor of Jitte, or just nothing at all.. it's a great card but fairly expensive.. at 5mana.
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I'd recommend taking out two more plains and adding in 2 more Mutavaults. Look into the newer card "Honor of the pure" over glorious anthem. Try to get 4 captains if possible. Just drop the 2 door of destinities for two more honor of the pures. Maybe look into more ballyrush banners, Harm's Way, Brave the Elements.. i'm not sure the format of this deck (Extended, or Standard) or what... each one just has different card restrictions, it's at least Extended, since preeminent captain is not playing in Standard. Other than that need to explore what creatures you'd like captain to bring out, (you can put a couple expensive ones, but i woudlnt' put to many... ) Then lastly consider getting Path to Exile.
I'd recommend Brave the Elements, and Harm's Way.. and consider Jitte.
Here's my deck (extended legal Soldiers): http://www.mtgvault.com/ViewDeck.aspx?DeckID=46861
Surprisinly Lich's Mirror might be worth side-decking.. I mean I knew when I first made a deck I had 0 artifact killer's. All I had to stop an artifact was to mana leak when they played it. or have a meddlign mage before they played it, both of which were in my side deck. My biggest tip would probably be taking out some of them more mana costly cards and lowering htem to 2 or perhaps taking some out all together, and fill up with more of hte cheaper costing cards. Honor of the pure would work great with your deck, as would that card that says all white creature get +1/+1 all other types get -1/-1 vs some decks that card is like a wraith of God that only hits your opponent.
Mutavaults are a must have land, they're simply amazing. I'd definitely considering at least side decking Harm's Way. Your cards seem kind of expensive to play, you may consider putting some Ballyrush Bannerets in as well. And I dont' consider Arid Mesa, and Flats mana acceleration, as opposed to Deck Thinners. So you have a high probability of getting mana early (when you need it) and lower later on in the game when many decks dont need a ton of mana.
I'm not sure what the current standard metagame is like, but I would say drop the Safe passage in favor of 2 more Brave the elements. And maybe Disenchant over Solemn offering? Look into two more path to exiles.... and probably squeeze in 3 Jitte's. I don't know if these are all cards you own, so the ideal deck isn't easily attainable, but those would be my biggest suggestions. Jitte turns any creature into a beast.
Get 4x path to exile, 4x mutavualt, 4x honor of the pure.. drop coat of arms. Recommend pre-eminent captain over Benalish commander.
I woudln't do coat of arms, is way to slow... I'd lower down to 60 cards. Add 4 mutavualts in place of 4 plains. Drop 3x Cenn's tactician pick up a pre-eminent, Daru warchice, and a field marshal. Drop 3x Benalish commander, drop 1 captain of the watch, Drop 1 Rhox Pike master, and 1 Armormorer. And pick up 1 ballyrush banneret. That should put you at 60. And I'd probably recommend dropping 2xConquerors pledge. Maybe put in 2 harm's way instead. i feel your just really creature heavy, and lack defense of the creatures... and you definietely need path to exile, so maybe try to manage a way to get in 4 path to exile, and maybe a couple harm's ways... Since your playing with greater pool of cards than just extended legal (daru is extended illegal) I'd recoomend 4x Daru Encampent as other land. Take out 8 plains, an dput in 4x mutavault, and 4x Daru Encampment... The rest I leave to you.
I lied you do have one drops... I wouldn't recommend that land.
I'd recommend mutavaultx4... and potentially Windbriskheights.. but at a minimum the mutavaults will be useful. You don't need that much raw white mana, so a mutavault literally will still let you play everything you want. And maybe do 4 search lands instead of that comes in taped and you gain two. I know on turn one that's great because you have no one drops, but that can eff you in the match. I see a lot of people with Conqurors pledge, i'm not the biggest fan but it is very deadly. I am newer to magic so, i'll defer to you there. My current playing philosophy is not to play with 5+ mana cards. The captain can be brought out by pre-eminent. I'm not sure on the Jitte Vs. Elspeth. Probably in most cases Elspeth. I also have a soldier deck, maybe I'll try her out in place of my Jitte. I like her ++3+3 to target creature that's really sick. That protects you from burn and you can also create tokens. She does cost 4 mana so a bit of a slower card. Means minium of turn four. I wish she was a soldier so my Ballyrush Banneret's could help get her out. If the Story Circle doesn't protect creatures you control, eh.. not sure if it's main deck worthy. Awesome for Side negates burn. And great protection from a black deck.. they hit monsters, hand and land hard, but not enchantments an enchantment that can make you immune to all their black creatures damage, such as blood ghasts. That Might have to go in my side deck.. black is my most feared match up. I also run Harm's way, and Brave, in the main deck so burn isn't usually an issue, and I also run Lightning greaves in the side deck, which is amazing with pre-eminent. I almost feel like main decking them over jitte. And offers great protection against creature hate.