Izzet Spellementals is entirely red and blue, making Flashfreeze a premium answer to their red spells like Prismari Charm, Traumatic Critique, and Hearth Elemental. Disdainful Stroke counters big threats like Eddymurk Crab, Hearth Elemental, and Sunderflock before they hit the field. Inevitable Defeat is efficient removal for their bigger threats like Hearth Elemental or Sunderflock. Cut slower value cards like Consult the Star Charts and the clunky North Wind Avatar in favor of proactive interaction, since this matchup is a race to disrupt their engine before it snowballs. Your Day of Judgment and Jeskai Revelation remain key stabilizers for the late game.

UR Aggro relies heavily on red and green spells to fuel their aggressive strategy, so Flashfreeze is excellent, countering Devastating Onslaught, Michelangelo's Technique, and Temur Battlecrier. Pyroclasm sweeps their small creatures like Llanowar Elves and Spider Manifestation. Sear kills Temur Battlecrier and most other threats cleanly. Trim slow card selection like Consult the Star Charts since you need to be proactive with removal and efficient interaction against this fast clock. Keep Day of Judgment and Jeskai Revelation in as your top-end sweepers/stabilizers.

Dimir Midrange is full of efficient removal, card advantage, and disruption rather than cheap aggressive creatures, making your burn-based removal less impactful. Disdainful Stroke counters their mana value 4+ threats like Kaito, Bane of Nightmares. Spell Snare picks off their Bitter Triumph, Nowhere to Run, or Shoot the Sheriff at mana value 2. Strategic Betrayal forces them to exile a creature like Cecil, Dark Knight along with their graveyard. Keep Day of Judgment and Jeskai Revelation as your primary tools to stabilize and grind through their card advantage engines like Enduring Curiosity.