WU is loaded with Force of Will, Daze, Stifle, and Consign to Memory, all of which are strong against our noncreature reanimation spells, but our existing hand disruption (Thoughtseize, Unmask, Cabal Therapy) is already the best tool for stripping those answers before we commit. None of our sideboard options meaningfully improve this specific fight: Show and Tell and Stronghold Gambit are still vulnerable to the same countermagic, and the bigger creatures (Koma, Ashen Rider) don't dodge Swords to Plowshares or bounce from Karakas/Teferi any better than our current threats. We keep the 75 as is and focus on sequencing discard spells to clear a path before resolving Griselbrand or Atraxa, since Wasteland and Stifle are the main things that can disrupt our mana or graveyard plan.