Izzet Prowess is a low-to-the-ground tempo deck full of one-mana colorless/instant spells and cheap blue spells, making Consign to Memory (which counters colorless spells and triggered abilities for as little as {U}) extremely efficient against Mishra's Bauble and their token/equipment shenanigans. Mystical Dispute is cheap and often free against their many blue spells like Preordain and Expressive Iteration. Orim's Chant is too slow and doesn't stop damage already on the stack from a fast aggressive draw, so cut it for the more reactive package. Spell Snare only ever hits their two-mana spells like Cori-Steel Cutter, which is far less impactful than blanket countermagic; keep Galvanic Discharge and Solitude in as your key removal for Dragon's Rage Channeler and Slickshot Show-Off. Prioritize protecting your life total and disrupting their Cori-Steel Cutter plan since it can generate huge card and mana advantage if left unanswered.