Oops, All Spells! runs zero lands, making Wasteland, Ghost Quarter, and Smallpox's land-destruction and creature-sacrifice modes entirely blank — trim them all. The deck wins by milling its library with Balustrade Spy or Undercity Informer and then flashing back Dread Return (no mana spent) to reanimate Thassa's Oracle; Void Mirror counters both Dread Return on flashback and any Pact of Negation they hold up for protection, making it one of the most impactful cards in the matchup. Name Balustrade Spy or Undercity Informer with Disruptor Flute to lock off the mill trigger entirely; if they have both in hand, Thoughtseize first to strip the duplicate. Endurance is the premier reactive answer — flash it in after they fire Dread Return to shuffle their graveyard back into their library, stranding Thassa's Oracle and undoing the entire combo line. Post-board they bring in Xantid Swarm to shut off interaction on their turn; Sheoldred's Edict answers it cleanly, and Faerie Macabre provides a zero-mana graveyard exile to break up Bridge from Below or Narcomoeba before Dread Return resolves.