The owner of this deck hasn't added a sideboard, they probably should...
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ERADICATE! (improvement suggestions needed thx)
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In a single-color deck you rarely if ever need that much land unless you have specific cards that take advantage of having a lot of lands in play. Furthermore, you have 4 Dark Rituals in this deck, so you've got more than enough mana sources. I would take two lands out and add two more Nightmares which is your only card in here that directly benefits from having a lot of lands in play. Brought out mid-to-late game, a powerful Nightmare can end the game for you quickly.
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Ditto. Otherwise, not a bad build :)
I prefer Wall of Souls over Wall of Bone.