Oops! All Spells runs zero lands and wins by milling its entire library with Balustrade Spy or Undercity Informer, then flashing back Dread Return to reanimate Thassa's Oracle — making Wasteland, Boseiju, and Barrowgoyf nearly worthless here. Snuff Out is your most efficient interaction: cast it in response to a Balustrade Spy or Undercity Informer being cast, killing the creature before it enters the battlefield so its trigger never fires, all for just 4 life. Endurance is the premier silver bullet — flash it in once their graveyard is stocked to exile everything, stranding their Dread Return with no creatures to sacrifice or return. Gaddock Teeg locks out Dread Return (a four-mana noncreature sorcery, including its flashback), and also preemptively shuts off post-board Goblin Charbelcher and Beseech the Mirror. Force of Vigor handles the post-board artifact package — Chrome Mox and Lion's Eye Diamond — for free, and the fourth Thoughtseize gives you additional pre-combo disruption alongside Green Sun's Zenith, which can still tutor Endurance, Ouphe, or Teeg on demand.