Dead/Gone's Dead side deals 2 damage which won't kill Griselbrand or Archon of Cruelty but the Gone side bounces either back to hand, undoing their reanimation and forcing them to pay the mana cost again. Void Mirror catches Unmask when they cast it for free by exiling a black card, since no mana is spent to cast it. Trinisphere is weak here since several of their key spells (Dark Ritual, Cabal Therapy, Reanimate) are already cheap, and the tax hits our own Chrome Mox and cheap spells too. Magus of the Moon stays in: most of their manabase is nonbasic lands (fetches, duals), so Magus or Blood Moon turns them into Mountains and strains their black mana. Shatterskull Smashing is a poor answer to their large creatures (it needs X of 6 or more to kill a 6/6), so trim one copy to make room.