Oops! All Spells is a zero-land combo deck that wins by milling its entire library with Balustrade Spy or Undercity Informer, then using Narcomoeba triggers to flash back Dread Return and put Thassa's Oracle into play. Faerie Macabre is your most critical sideboard card — you can exile Narcomoeba from their graveyard in response to the Dread Return trigger, cutting off the Oracle win at essentially no mana cost. Consign to Memory serves double duty: it can counter their Pact of Negation when your combo is on the stack, or can counter the Balustrade Spy or Undercity Informer trigger itself to stop the mill chain entirely. Spell Pierce comes out because their key spells either cost nothing (Pact of Negation) or are backed by Dark Ritual mana that lets them pay the two easily, while Flusterstorm is strictly better here since it also catches their Thoughtseize and Duress as sorceries. Simian Spirit Guide and Archon of Cruelty are trimmed because this is a pure speed race — you want your fastest Sneak Attack into Emrakul lines and fewer redundant bullets that don't interact with the opponent's gameplan.