Affinity relies heavily on colorless artifact spells (Mishra's Bauble, Mox Opal, Engineered Explosives, Tormod's Crypt), so Consign to Memory is a premium one-mana answer that scales with replicate against their swarm. Mystical Dispute is discounted against their blue spells like Metallic Rebuke. Day's Undoing is very risky since it can refill their hand into more cheap artifacts, and Prismatic Ending and Counterspell get trimmed since Consign to Memory is simply more efficient against their colorless-heavy gameplan. Galvanic Discharge struggles against Kappa Cannoneer due to Ward {4}, but remains effective against their other small creatures.