Replenish lives and dies on resolving Opalescence plus Parallax Wave or Decree of Silence, so Naturalize and Ray of Revelation are premium answers that can strip their lock piece or Opalescence itself before it locks you out. Duress is excellent proactive disruption, taking a Replenish, Attunement, or Swords to Plowshares before they can use it, and it also finds information on whether they're holding the combo. Cut redundant reanimation targets like Karmic Guide and Battlefield Scrounger since you only need one payoff resolved, and Elvish Spirit Guide/Squee are lower priority than answering their engine. Race them if possible — once Opalescence and Parallax Wave are both online, the game becomes very difficult to win.