Death and Taxes (Yorion) floods the board with small efficient bodies like Stoneforge Mystic, Thalia, Guardian of Thraben, and Recruiter of the Guard, making Massacre's -2/-2 a near-mainboard-quality sweeper that often resolves for free against a deck likely to control a Plains while we hold a Swamp. The extra Collective Brutality adds discard to strip Swords to Plowshares or Thoughtseize before we commit a reanimation target, plus more -2/-2 removal. Unmask is weak since this deck doesn't overload on must-answer noncreature spells worth stripping, and Cabal Therapy's conditional sacrifice cost is clunky here. Keep the full reanimation engine since our top-end easily outclasses their small creatures once resolved.