This is a unique take on the MonoBlack archetype, maximizing the powerful Devotion ability from Gray Merchant of Asphodel while also taking advantage of some sacrifice synergy with Nantuko Husk and/or Vulturous Aven combined with cards like Black Cat, Dutiful Attendant, and Sultai Emissary. The White splash primarily allows it to run Pacifism, but also gives it access to Pillar of Light and Revoke Existence in the Sideboard.
The deck ended up going 3-0 in the Swiss rounds, but BambooRush didn't participate in the Top 8 playoffs for some reason (I was absent for this event, so I am not sure what happened). If you're interested, I encourage you to click on the link and watch all the videos for yourself. And be sure to follow BambooRush on Twitter for more great Pauper content!