Affinity relies heavily on free and zero-cost artifacts like Mishra's Bauble and Mox Opal; Vexing Bauble counters those uncast-for-mana plays outright and can also shut down Urza's Saga's free-ish token creation timing since it triggers off casting spells with no mana spent, making it a strong tempo disruptor here. Claim the Firstborn can steal a cheap Pinnacle Emissary or Kappa Cannoneer before it grows out of hand. Cool but Rude helps close games quickly against a deck that can otherwise stabilize with Weapons Manufacturing value. Ox of Agonas is cut for being too slow and card-disadvantageous against their fast, low-curve gameplan.