WU is a countermagic-heavy deck built around Force of Will, Daze, Stifle, and Teferi, Time Raveler, so Chancellor of the Annex revealed from our opening hand taxes their first spell for free, disrupting their early Ponder or Brainstorm sequencing before we start our own turns. In the late game its flying body and continuous counter-unless-pay-1 ability keeps punishing their cantrip-dependent gameplan. We trim Throes of Chaos as our weakest cascade spell since this matchup is about grinding through countermagic rather than maximizing card selection. Be mindful that Teferi, Time Raveler can strip our ability to respond at instant speed, so sequence cascade spells on our own turn when possible.