Jeskai Ephemerate is a value-engine control deck built around blinking Mulldrifter and Augur of Bolas with Ephemerate while protecting its plan with Counterspell and Dispel, so Duress proactively strips a counterspell or Ephemerate before they can use it to generate card advantage. Drown in Sorrow's -2/-2 sweeps away their small value creatures like Augur of Bolas (1/3 survives, but kills tokens from Murmuring Mystic) and Faerie-sized bodies while scrying to find action. Tithing Blade is weak since the opponent floods the board with small value creatures rather than a single threat worth punishing, and Campfire's life gain doesn't keep pace with their card advantage engine. Keep Nihil Spellbomb in case Archaeomancer recursion becomes relevant.