Annul counters key artifact spells like Refurbished Familiar, Utrom Monitor, Glint Hawk, or Cryogen Relic before they land, disrupting Affinity's board development. Suffocating Fumes only shrinks their creatures by -1/-1, which kills Refurbished Familiar (2/1) but not Kor Skyfisher (2/3) or Glint Hawk (2/2), so we trim one copy for a more proactive answer. Blue Elemental Blast and Hydroblast stay in the sideboard since Affinity casts no red spells here. Keep Cast Down and Snuff Out as premium removal for Kor Skyfisher and Glint Hawk before they can bounce artifacts for value.