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Favor efficient dual lands, fetchable fixing, and color smoothing so you can cast Dragons on curve without hesitation
4 Knight of the Ebon Legion 4 Kitesail Freebooter 3 Seekers' Squire 4 Yarok's Fenlurker 2 Lurrus of the Dream Den 4 Ayara, First of Locthwain 4 Murderous Rider 4 Phyrexian Obliterator 1 Ravenous Chupacabra 1 Dread Presence 4 Gray Merchant of Asphodel 1 Cavalier of Night 20 Swamp 4 Castle Locthwain 1 Massacre Girl 4 Brain Maggot 1 Cavalier of Night 2 Ravenous Chupacabra 2 Plaguecrafter 2 Tymaret, Chosen from Death 2 Blast Zone 1 Umori, the Collector Most mono-black devotion decks follow a certain progression up the curve in order to work
Transforming it late is going to feel like a pretty good use of your mana, too
Garruk Wildspeaker is just a one-of, but it gives us another way to untap Nykthos, Shrine to Nyx while also adding some extra green mana symbols to the battlefield to up our devotion