Mono Black

[Badwulf]

Mono Black 70 cards, 4 sideboard 1 {Barren Moor} 2 {Crypt of Agadeem} 20 {Swamp} 1 {Mutavault} 1 {Vivid Marsh} 25 lands 3 {Tormented Soul} 2 {Highborn Ghoul} 1 {Blood Scrivener} 1 {Nighthowler} 1 {Herald of Torment} 1 {Spiteful Returned} 1 {Geralf's Messenger} 2 {Gray Merchant of Asphodel} 1 {Gnarled Scarhide} 2 {Erebos, God of the Dead} 2 {Abhorrent Overlord} 3 {Crypt Ghast} 20 creatures 1 {Sign in Blood} 1 {Liliana of the Dark Realms} 2 {Corrupt} 1 {Curse of Shallow Graves} 1 {Ghoulcaller's Chant} 2 {Whip of Erebos} 1 {Enslave} 1 {Sanguine Bond} 1 {Extinguish All Hope} 3 {Murder} 2 {Hero's Downfall} 3 {Dark Ritual} 1 {Worst Fears} 1 {Gravepurge} 21 other spells Sideboard 1 {Grisly Spectacle} 3 {Shadow Slice} 4 sideboard cards

[Ekann1]

Why vivid marsh? Seems strictly worse than a swamp in this deck.