Gale, Waterdeep Prodigy

Cast an instant and a sorcery answers from below; cast a sorcery and an instant returns fire. The trigger is checkerboarded on purpose, which means the deck this wizard wants is not a pile of the best spells but a balanced ledger of both types, each cast setting up the recursion of the other. That alternation is what pulls it apart from a straight flashback engine: you cannot chain instant into instant into instant, only alternate, so every turn you hold both a fresh spell and a target waiting below forces a real sequencing decision. The graveyard here is not a stockpile you dip into freely; the exile clause on each recast spell makes every grave-cast a one-shot, so the payoff is the tempo of casting two spells for one card's worth of investment rather than grinding the same spell over and over. As a spellslinger commander the 1/3 frame is not what earns the slot; the card functions as a rules-text prism that doubles your spell output while demanding a symmetric list to feed it. Choose a Background bolts a second identity onto that frame, letting a single blue caster reach into a partner's colors without abandoning the alternation that keeps the core trigger firing.