Izzet Prowess is a pure race — they're trying to kill you before you can assemble Goblin Charbelcher or go off with Lotus Bloom, and they'll bring in Consign to Memory and Hurkyl's Recall to disrupt your artifacts. Your free and cheap counterspells (Disrupting Shoal, Jwari Disruption, Force of Negation) are your best tools for protecting your combo pieces and slowing their early threats. Spell Snare and Stern Scolding are too narrow and conditional here — Flusterstorm and Mystical Dispute come in as more reliable interaction against their cheap spells and potential sideboard disruption. Prioritize countering Cori-Steel Cutter and Stormchaser's Talent since those cards snowball quickly; a stalled board where they can't pump gives you the turns needed to combo off.