Need 4x Inquision of Kozilek 

You should add Sign in blood; that way if the to card isn't black you can draw two cards and hope for a black card. 

Sideboard must be sxactly 15 cards

id take out all the vampires and put in perimiter captains instead
That, or myrs

I'll make a few other suggestions bro: 


1 more nighthawk, it is so awesome and you need 4. 


Gatekeeper of Malikus or something is great because it causes a force sac, it can get rid if indestructibility. 


I'd remove falrath exterminator and I'd sideboard unmake,


Finally, I'd do 13 swamps//7 mountains.

You may consider Feast of Blood