Replenish's entire game plan hinges on resolving Opalescence with Parallax Wave or Decree of Silence, and Duress strips Attunement, Replenish, or a counterspell from their hand before they can set up the combo. Mind Harness stays in the sideboard: it can only enchant a red or green creature, and none of their permanents are red or green, so it has no legal targets in this matchup. Mulch is cut since there's no value in filling our graveyard against a combo-control deck we need to disrupt proactively instead. Wasteland remains important against their Ancient Tomb and Adarkar Wastes to slow their fast mana into Replenish.