Sultai Aluren is a combo deck relying on Show and Tell, Aluren, and Stock Up to assemble a quick Atraxa/Acererak/Emrakul game plan, so free countermagic is critical. Force of Negation can be cast for free on their turn to stop Show and Tell, Aluren, or Omniscience, and Consign to Memory counters triggered abilities such as Atraxa's enter trigger, Acererak's enter trigger, or Emrakul's cast trigger that gives them the extra turn (Emrakul, the Aeons Torn itself can't be countered). Mockingbird is weak since copying their creatures (Atraxa, Acererak) isn't a good use of mana when we need to be interactive, and Wail of the Forgotten's upside is lower against a deck we need to be proactive and disruptive against rather than grinding card advantage. Keep Daze and Force of Will in as they are premium free interaction against this matchup's key enablers.