Maverick's game plan revolves around cheap disruptive creatures (Orcish Bowmasters, Stitcher's Supplier, Dark Matter Manipulator, Moonshadow) that Massacre's -2/-2 wipes cleanly, so we bring in both copies to reset the board. Surgical Extraction strips Hogaak out of their graveyard/hand entirely, denying their best reanimation-adjacent threat, and also disrupts Stitcher's Supplier chains. Unmask is weaker here since their hand is often full of cheap permanents rather than countermagic we need to clear, and one Cabal Therapy is enough disruption once Massacre is online. Keep Thoughtseize and the second Cabal Therapy to strip Force of Will and key threats before they resolve.