Chain of Vapor already in the mainboard is great for Opalescence, but bringing in a second copy isn't possible, so instead add Annul to counter Opalescence, Parallax Wave, or Attunement before they resolve (it can't touch Replenish, which is a sorcery, so leave that to Duress and the regular counterspells). That is far better than any creature removal since this deck has almost no creatures. Smother is nearly dead since there are no relevant creatures to kill, so trim it for the proactive enchantment answers. Keep Duress to strip their combo pieces before they can assemble Replenish, and keep counterspells at full density to fight through their Mana Leak and answer Swords to Plowshares and Replenish.