Sultai Reanimator relies on filling the graveyard to recur or copy threats, so Duress can strip their noncreature setup spells before they resolve. Strategic Betrayal is devastating here, forcing the opponent to exile a creature they control and their entire graveyard to deny recursion plans outright. Disdainful Stroke catches Bringer of the Last Gift or Overlord of the Balemurk regardless of whether it is cast for its impending cost or full value. Cut reactive removal like Nowhere to Run (weak against big bodies) and some countermagic that's too narrow against their large threat suite.