seems like a very fun and fast tribal deck. Maybe you could add 1 copy of Emeria the Sky Ruin for some late game creature return. Also some fetches to thin the deck. I am not sure how casual you want play though, so it may not be worth it.
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Hmmm, well first instead of Vess i would ass Liliana Vale. With you lack of creatures until late game her plus one could prove useful. I would also add two more mana leaks with an addition of thoutseizes. I would take out infest and despise.
change the name to WU control B is black
Sword of fire and Ice