Sultai Reanimator wants to land Bringer of the Last Gift or reuse graveyard threats like Overlord of the Balemurk, so answering their big payoff before it swings the game is the priority. The extra Strategic Betrayal exiles a creature they control and their graveyard, denying Bringer of the Last Gift's reanimation value. Day of Black Sun for a higher X sweeps their early creatures (Oblivious Bookworm, Formidable Speaker, Town Greeter) while stripping abilities so nothing dodges via triggered effects. The second Duress proactively strips noncreature enablers like Rapid Rescue before they can set up; Flashfreeze stays home since it misses their key black payoffs like Bringer of the Last Gift or Ardyn.