Affinity has no red cards, so Hydroblast stays boarded: it only hits red spells and permanents, and the opponent is white/blue/black. Pyroblast is live, though. It counters or destroys blue spells and permanents, and Baleful Strix, Utrom Monitor, Cryogen Relic and Thoughtcast are all blue. It can't touch the white, black or colorless threats like Glint Hawk, Refurbished Familiar or Myr Enforcer. Ancient Grudge is the main answer to those, destroying artifacts like Baleful Strix, Myr Enforcer, Refurbished Familiar, or Cryogen Relic, with flashback for a second kill. Their Mistvault Bridge and Razortide Bridge are indestructible and can't be killed, but Seat of the Synod, Vault of Whispers and Ancient Den can be destroyed. Dinrova Horror bounces a key permanent like Utrom Monitor or Baleful Strix while forcing a discard, disrupting their board and hand simultaneously. Keep the artifact mana base intact and lean on Ghostly Flicker loops with Mulldrifter and Mnemonic Wall to out-grind their affinity shell.