Force of Negation is strong against WU's noncreature-heavy plan, letting you stop a Teferi, Time Raveler or a Leyline-style enchantment for free on their turn. Null Rod shuts off Quantum Riddler's Warp casting from exile is unaffected, but it does nothing to their Stifle or Tamiyo plan; still, it's a reasonable sideboard tax if they have no other artifact reliance, so weigh keeping it in only if you have spare slots. Ponder trims slightly since WU's Stifle can punish fetchland-based shuffles less relevantly here, and Snuff Out is weak since many of their threats (Tamiyo, Phelia, Quantum Riddler) are at home to bigger removal anyway. Keep Thoughtseize in since it strips their Swords to Plowshares or Force of Will before they can protect a threat.