Oops! All Spells is a turn-1 or turn-2 combo deck that wins by milling its entire library with Balustrade Spy or Undercity Informer and reanimating a Thassa's Oracle via Dread Return — your primary goal is to counter the combo spell before it resolves. Force of Will, Force of Negation, and Daze are your most important cards; prioritize keeping hands with multiple counterspells over card-draw-heavy hands. Flusterstorm is exceptional here because the opponent generates multiple storm-like triggers and ritual chains that make it nearly impossible to pay for all copies. Surgical Extraction on a milled Thassa's Oracle or Dread Return can end the game on the spot if the combo fizzles. Wrath of the Skies and Erode are useless — the opponent has no meaningful board presence until they win, so those cards come out.