Izzet Phoenix wants to chain cheap cantrips and burn to enable Arclight Phoenix, so Spell Snare is great against Consider, Opt, Fiery Impulse, and Into the Flood Maw. Test of Talents strips a key copy of Treasure Cruise or Lightning Axe from hand, graveyard, and library while refilling your hand, which is excellent against their redundant cantrip suite. Mystical Dispute is cheap interaction against their all-blue core. Fires of Victory is too slow against their aggressive tempo plan, and one Negate and Three Steps Ahead come out to make room since countering individual cantrips matters less than answering their recurring Phoenixes with Fiery Impulse and Volcanic Spite.