Pyroblast is a strict upgrade over Dispel here since it can counter any of their spells regardless of type (they're mono-red) and can also destroy a resolved Kessig Flamebreather or Guttersnipe before it snowballs damage. Crypt Incursion gains meaningful life against a deck racing us with burn, and its creature-exile clause is irrelevant but the life gain alone is valuable. Ride's End and Fanged Flames are too narrow and slow against a deck with few relevant creatures, since their real threats are the Guttersnipe/Kessig Flamebreather payoffs we can snipe with Pyroblast or kill with Skred. Keep all four Skred and the Counterspell/Ephemerate engine online, since Skred scales well off our 15 snow permanents and kills their key engine creatures outright.

Dimir Control's threats (Gurmag Angler, Thorn of the Black Rose, Okiba-Gang Shinobi, Spellstutter Sprite) are mostly small or graveyard-fueled, and Crypt Incursion can both exile their Gurmag Angler fuel/recursion targets and gain meaningful life in a grindy matchup. Fanged Flames is replaceable since we already have four Skred for removal and don't need the extra copy against their low creature count. This is primarily a counter-magic and card-advantage mirror, so keep Counterspell, Dispel, Lorien Revealed, and the full Ephemerate/Mulldrifter/Archaeomancer value engine fully intact. Avoid overboarding, since our raw card quality already wins long games against their deck.

Affinity floods the board with artifact creatures and artifact lands, so Dust to Dust exiles two artifacts at once, taking out threats like Utrom Monitor or Refurbished Familiar, or even hitting nonbasic artifact lands like Ancient Den or Seat of the Synod to slow their mana. Ethereal Haze only buys one turn against a deck that wins through sustained board presence rather than a single big attack, and Ride's End and Fanged Flames are both single-target removal spells that are less efficient than two-for-one Dust to Dust against their swarm of cheap artifact creatures. Keep all four Skred, since it kills almost anything they play once we have a few snow permanents out. Prioritize resolving Dust to Dust early to strip their key enablers like Thoughtcast fuel and Cryogen Relic before they snowball card advantage.