This is the exact mirror match, so the game revolves around who assembles their reanimation plan first and protects it with discard. Surgical Extraction is strong here since it can exile a key reanimation target like Griselbrand or Atraxa, Grand Unifier out of their graveyard entirely, denying their Animate Dead or Shallow Grave a target. The extra Collective Brutality gives more discard to strip their instant and sorcery enablers (Dark Ritual, Reanimate, Shallow Grave) before they combo off; its discard mode can't take Animate Dead, since that is an Aura enchantment. Unmask is slightly weaker here since both players have similarly fast hands and it costs you either a card or four mana, so trimming a couple of copies for more targeted graveyard disruption is correct; keep the rest of your core engine untouched since speed matters most.