The extra Stifle is your best tool here, countering their Hermit Druid activation outright (it's an activated ability) before it mills their whole library, which is the cleanest way to stop the combo entirely. Extra Cabal Therapy copies let you strip Survival of the Fittest, Unearth, or a key combo piece like Volrath's Shapeshifter from their hand before they can assemble the kill. Duress is trimmed down (not fully cut) since it's still reasonable proactive disruption against their combo pieces, but Stifle and Cabal Therapy are more surgical answers to their specific game plan. Keep one Duress in since stripping Survival of the Fittest or Unearth preemptively is still valuable.