Help For Mox Sapphire Tournament Deck 2

[DirtyMustachio]

Help For Mox Sapphire Tournament Deck 2 75 cards, 15 sideboard Next weekend 4 {Cathedral of War} 18 {Swamp} 22 lands 4 {Tormented Soul} 2 {Nefarox, Overlord of Grixis} 4 {Duty-Bound Dead} 4 {Knight of Infamy} 2 {Disciple of Bolas} 2  {Vampire Nighthawk} 20 creatures 4 {Sign in Blood} 4 {Tragic Slip} 4 {Cower in Fear} 4 {Murder} 4 {Essence Harvest} 20 other spells Sideboard 4 {Smallpox} 4 {Killing Wave} 4 {Mutilate} 3 {Tormod's Crypt} 15 sideboard cards

[Guitello]

-4 {Death Wind}
+4 {Murder}

[Guitello]

Also more lands. 20 is not enough for a deck running Nefarox

[DirtyMustachio]

Thanks I figured since it was mono black it would be okay, but I'm here to take advice so that's what I'll do

Updated