Consign to Memory gives us crucial interaction against their win condition by targeting Thassa's Oracle's triggered ability or countering colorless spells like Lion's Eye Diamond and Lotus Petal. Chalice of the Void set at one is tempting, but while Dark Ritual is one mana value and Lion's Eye Diamond is zero, Doomsday itself has a mana value of three, and Chalice is symmetric and risky against our own Lotus Petal/Mox Opal engine, so it comes out. Extra Force of Negation lets us pitch a blue card to counter their Doomsday itself for free, which is our single best interaction point. Hydroblast has no legal targets in this matchup since the opponent has no red cards, so it stays out of the plan; Kappa Cannoneer is one of our slowest, most tap-out threats and is cut since we want to hold up interaction rather than overextend into Daze/Force of Will.