This is a combo race where both players are trying to assemble their win condition before the opponent can interact; Oops! wins by casting Balustrade Spy or Undercity Informer with no lands in library, triggering Narcomoeba, then flashing back Dread Return to reanimate Thassa's Oracle. Dauthi Voidwalker is the premier hate card here — a resolved Voidwalker exiles cards as they hit the graveyard, neutering the entire Narcomoeba trigger and Dread Return engine simultaneously. Use Thoughtseize aggressively to strip their protection (Pact of Negation, Duress) or a key creature before you attempt to go off; Force of Negation and Consign to Memory provide free interaction to stop Balustrade Spy or Undercity Informer from resolving on their combo turn. Daze is cut because their dense suite of zero-cost mana sources (Elvish Spirit Guide, Simian Spirit Guide, Lotus Petal) makes it unreliable, and after sideboard they add Goblin Charbelcher and Beseech the Mirror as faster alternate lines that Consign to Memory can also answer.