Perfect Vampires (B/r)

this is basically the stock vampires list with some red replacements. tendrils and urge to feed became bituminous blast and terminate. sign in blood and mind sludge were replaced with blightning. i didnt like that mind sludge was only good against certain decks (blightning is much better against aggro), and i really wanted a manland, so i feel this is an improvement. slave of bolas is there in the sideboard as an experiment. word on the street says that jund is a bad matchup for vampires, so stealing their sprouting thrinax and getting all of the dudes for yourself should hopefully help with that, i havent drawn it against jund yet though. this list seems good to me but if there are any suggestions, id be happy to consider them.