This deck plays well, I won all 6 games I played with it.
Although I found
Floating-Dream Zubera to be an odd choice for this deck.
Canonfodder just for the card draw? A bit weak.
Maybe
Echoing Truth, for the extra removal, or the classic Prodigal sorcerer, to knock out the little ones you don't want to waste a control- or counter spell on. (My elves-decks don't like him at all.

)
Vedalken Mastermind could also be usefull in this deck. As a protector of Sower Of Temptation or to put
Man-o'-War back in your hand to use it again.
Memnarch is also a lot of fun in a mono-blue control deck like this. (a bit expensive, but you can steal everything your opponent plays, even lands.

)
Faerie conclave would work nice with the creature theme of this deck and gives you a potential extra creature to deal damage with.
And I would replace 4
Island with 4
Mox Sapphire, just for the speed boost it can give your deck.