UBG Reanimator relies entirely on the graveyard via Faithless Looting, Animate Dead, Shallow Grave, and Reanimate to cheat out Atraxa, Griselbrand, and Archon of Cruelty, so Leyline of the Void is a devastating hate piece that can end their game plan outright, especially if it's on the battlefield from the opening hand. Sundering Eruption is cut since it doesn't stop their graveyard shortcuts, and one Chrome Mox comes out to make room while keeping our own fast mana intact. Chalice of the Void set to 0 is strong against Lotus Petal, while set to 1 it counters Dark Ritual and Faithless Looting. Keep Magus of the Moon and Blood Moon in, as they punish the opponent's mix of dual and fetch lands while doing nothing to slow our own basics-heavy manabase.