Affinity floods the board with cheap artifact creatures and artifact lands, making Dust to Dust a premium answer that can two-for-one key pieces like Cryogen Relic, Refurbished Familiar, or even hit two of their artifact lands in a pinch. Cut Preordain since you need proactive interaction rather than more card selection against their fast low-curve plan. Keep Counterspell and Skred (which scales with your snow lands) as efficient removal against their small creatures, and lean on Ephemerate/Mulldrifter for card advantage to out-grind their go-wide strategy.