Izzet Spellementals is entirely blue-red, but Flash Freeze only counters red or green spells, so it is narrower than it looks. It hits their red cards: Prismari Charm (which is both blue and red), Burst Lightning, Impractical Joke, Traumatic Critique, and Hearth Elemental, including its adventure side. It does nothing against their mono-blue spells like Sleight of Hand, Opt, Flow State, Eddymurk Crab, Sunderflock, Get Out, and Spell Snare. Tishana's Tidebinder is a strong flash threat here, countering the enters-the-battlefield trigger on Eddymurk Crab and stripping the Crab of its abilities, and it can also counter the activated ability of a Ghost Vacuum. It can't counter spells, so don't expect it to answer Traumatic Critique or Prismari Charm. Nowhere to run's -3/-3 struggles to matter against their bigger late threats like Sunderflock, Eddymurk Crab, and Hearth Elemental, so it's cut for cards that answer their spells and abilities. We Say Thee Nay! is trimmed since this opponent has enough mana and card selection to play around a soft counter.

No sideboard cards were provided, so the maindeck 75 must be played as-is. Floodpits Drowner is useful for tapping down Hearth Elemental and Eddymurk Crab before they take over, and it can shuffle them away once they carry a stun counter. Requiting Hex only hits creatures with mana value 2 or less, so it can't kill Hearth Elemental, Eddymurk Crab or Sunderflock and has few targets in this matchup. We Say Thee Nay! can disrupt their Prismari Charm or Traumatic Critique. Watch out for Eddymurk Crab getting cheap off their graveyard; try to race before Sunderflock bounces your board.

No swaps are made in this matchup. Against UR Aggro's cheap cantrips and the Slickshot Show-Off/prowess tempo plan, the maindeck's Requiting Hex and Floodpits Drowner are already well-positioned to pick off their small creatures, while Enduring Curiosity and Kaito, Bane of Nightmares provide card advantage to outlast their burn. Prioritize removing Elusive Otter and Slickshot Show-Off before they snowball with spell triggers.