Affinity is almost entirely nonland artifacts, making Meltdown a devastating sweeper that can wipe their board at low X since most of their key permanents (Mox Opal, Mishra's Bauble, Engineered Explosives, Welding Jar) sit at very low mana values. Hurkyl's Recall bounces their entire artifact board including Kappa Cannoneer and Urza's Saga constructs back to hand, resetting their tempo and mana. Spell Snare only hits mana value 2 and their deck is a mess of 0, 1, 4, 5, and 6 mana value cards, so it comes out entirely for the more impactful sweeper effects.