Oops, All Spells! wins by casting Balustrade Spy or Undercity Informer to mill its entire library (it runs zero basic lands), then flashbacking Dread Return to reanimate Thassa's Oracle for the win. Name Balustrade Spy with Disruptor Flute on turn one if possible — this single artifact shuts off their primary combo line and forces them to rely on the slower Undercity Informer plan. Keep Force of Will and the new Force of Negation as hard counters through their Pact of Negation protection, and hold Mindbreak Trap as a blowout answer when they chain Dark Ritual and Cabal Ritual trying to go off. Tormod's Crypt is the key backup — crack it in response to Dread Return's flashback to exile Thassa's Oracle and fizzle the win; Emry can recur spent Crypts if needed, though the redundancy of four copies makes a one-of cut reasonable. Prioritize casting Chalice of the Void on one before your hand is stripped by Duress and Thoughtseize, as it locks out their entire ritual and discard suite in a single early play.