UBG Reanimator is also a fast graveyard-based combo deck using Reanimate, Animate Dead, and Shallow Grave to cheat Griselbrand or Atraxa into play, and they can bring in Leyline of the Void from the sideboard, which exiles cards headed to your graveyard instead and would shut off Narcomoeba's self-mill trigger and any Dread Return-based line entirely. This is otherwise mostly a race, since their maindeck Unmask, Thoughtseize, and Cabal Therapy are aimed at protecting their own combo rather than stopping yours.