You have 7 Exquisite Blood's
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Find some artifacts/enchantments that give your creatures shroud or protection
Instead of priest of titania add elvish piper, might make the deck a bit more playable
People use dark depths plus vampire hexmage to activate depths by turn three you could try making a deck based around that
awesome deck can you help with mine? http://www.mtgvault.com/ViewDeck.aspx?DeckID=39163