Izzet Spellementals reduces the cost of Eddymurk Crab through cheap spells, but most of their support creatures (Sunderflock aside) die to a 2-damage sweeper before they get out of hand, so Pyroclasm is strong early. Voice of Victory denies them Spell Snare, Get Out, and other cheap interaction on our turn, letting our threats resolve cleanly, while Origin of Metalbending can save one of our key creatures from their removal suite. Lost in the Maze taps down only a couple of their many threats and North Wind Avatar is too slow against a tempo-oriented opponent, so both come out along with the weaker damage mode of Prismari Charm. Watch out for a fast Eddymurk Crab or large Hearth Elemental and prioritize removing them.

UR Aggro fills the board with cheap creatures like Llanowar Elves and Spider Manifestation, most of which have 1 or 2 toughness, so Pyroclasm and Fire Magic (cast at Fira for {2}{R} to deal 2) are excellent sweepers here. Voice of Victory also shuts down their ability to hold up Spell Pierce on our turn, protecting our own development. Lost in the Maze only taps down a couple of threats and doesn't answer the deck's card advantage engine, while North Wind Avatar and a copy of Winternight Stories are too slow against this tempo strategy. Prioritize surviving to turn 4-5 where our bigger threats simply outclass their board.

Dimir Excruciator wants to strip our hand with Duress and Deceit, then close the game with Doomsday Excruciator or removal like Bitter Triumph and Requiting Hex, so Voice of Victory is excellent to protect our development from instant-speed removal on our turn. Omni-Changeling and Terror of the Peaks give us resilient, hard-to-answer threats that punish them for tapping out. Lost in the Maze is weak since they don't flood the board with creatures early, and Prismari Charm's small modes underperform against their bigger threats like Superior Spider-Man and Doomsday Excruciator, so both are trimmed. Play around Duress and Deceit by sequencing our most important spells carefully.