Izzet Prowess is a fast burn/tempo deck with Monastery Swiftspear, Dragon's Rage Channeler, Lightning Bolt, and Expressive Iteration. Veil of Summer makes our spells uncounterable against their blue counterspells and grants hexproof from blue, while also drawing a card if they've cast a blue spell (like Expressive Iteration or Preordain) this turn. March of Wretched Sorrow comes in as removal that gains life to help us stabilize. Plunge into Darkness is too slow and life-costly against a deck this fast, and Revitalizing Repast doesn't protect us from a deck that kills via direct damage to the face, not combat, so those come out for proactive protection and disruption.