Added 1 more Underworld Connections. Took out 2 lands. Put Tribute to Hunger in the Sideboard along with a Murder. Took previously added creatures from Sideboard out. Added 2 Vampire Nocturnus and Necropolis Regent. Mana curve seems to still be doing well with the additions of creature and subtraction of land. Was debating on taking out Nefarox I'm still unsure though.
Added Underworld Connections and took out a Dead Weight. Added Harvester of Souls, Reaper of the Abyss, Curse of Death's Hold to Sideboard. Still to Test at FNM to see how well it does.