The owner of this deck hasn't added a sideboard, they probably should...
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I really like Dauthi Slayer and it plays well with mono-black devotion.
Pretty obvious, but sure. This is all about smart play of creatures. Don't play Cadaver Imp unless you have a card to dig for, don't play Gray Merchant until enough creatures are out, and don't waste a Victim of Night on something small unless it has some amazing ability or you're about to die. Better to react with those creature kills.
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