why do you use sphere of the suns since you run mono-colour. Use iron myr or you can try pristine talisman although it is 3cc and u get to gain 1 life and 1 mana. You can even tap for 1 life even if you have nothing to cast. For suns, its 2cc but come into play tapped. So its as good as a 3cc artifact mana source. But if you insist on sphere of the suns, then i would take out incinerate and go with volt charge since it deals 3dmg and gives all your spheres an extra counter.
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what is your winning condition? tez or infect or the empires artifacts? I feel that you have to try to be more focused. But with tez around its a major boost to the deck. I also have a mono-white empire deck you can take a look.. http://www.mtgvault.com/ViewDeck.aspx?DeckID=241810
how about the white/blue ally approach with ondu cleric and shapeshifter? they gain pretty much life too.
I think battlegrace angel is better than serra angels
replace your 3x naya charm and 2x violent outburst with 3x manabarbs, 2 x oblivion ring. You will be surprise how fast your opponent dies. replace sharkhan vol with arjani vengrant. (you can tap and also deal damage). lastly replace 1 x druid with 1 x talus paladin, replace 2x of your allies with 2 x cleric (so you can gain life to support the manabarbs where your opponent can't) You don't really need much land for this deck. You can cast anything with 2 plains, 1 forest and 1 mountain.
Traumatize is not a bad card. you can combo it with keening stone from eldrazi set for instant win...
I put in Goldmane for the +1/+1 vigilance, just cast him out and slowly waste him for the counters and vigilance...
yea.. thats providing your opponent blocks it. I like your input though. Would like to have more feedbacks on how to improve it further without using the usual BSA, Ranger of Eos etc...