My suggestion would be to take out like 2 swamps. Playtesting it, it seemed to get mana flooded sometimes. Also bloodline keeper might not be the most reliable, given that there are few vampires in the deck.
+1 , lots of good cards in this deck
I really like to hit huge Exsanguinates and my playgroup plays a ton of land destruction. Perhaps the swamps could be cut down. But, I run it all the time and it runs very well. Also, Bloodline Keeper is a good card in and of himself. Making 2/2 guys is simply that good.