Vivi Ornitier chains cheap noncreature spells to grow into a mana engine, then converts that mana into lethal damage via Crackle with Power, Thunder Salvo, or Volcanic Geyser. Choco-Comet and Impact Tremors create secondary damage layers when creatures enter, while Ral, Crackling Wit generates token bursts that scale with spell velocity.
Vivi's counter-mana loop: Each noncreature spell puts a +1/+1 counter on Vivi and deals 1 damage to each opponent. Once Vivi has power, its {0} mana ability (activate only once per turn) adds X mana in blue or red, where X is its power—this fuels the next spell without tapping. Spell acceleration: Molten-Core Maestro and Stormcatch Mentor reduce spell costs; Goblin Electromancer and Vadrik, Astral Archmage further discount your instants and sorceries. Cheap cantrips (Ponder, Preordain, Sage of Epityr) and card-draw engines (Mystic Remora, Rhystic Study, Curiosity) keep your hand full. The kill routes: Once Vivi reaches 5+ power, Crackle with Power (five times X damage to X targets) or Thunder Salvo (X damage plus 2 for each other spell cast this turn) end the game in a single turn. Electrodominance chains into free spell casts, bypassing mana costs entirely. Wishing Well and Omniscience unlock explosive free-cast turns. Secondary payoffs: Ral, Crackling Wit's +1 creates Otter tokens that scale with your spell count; paired with Impact Tremors or Choco-Comet, those entries convert into damage. Guttersnipe, Balmor, Battlemage Captain, and Stormcatch Mentor layer additional damage per spell cast. Archmage's Newt grants flashback to graveyard instants and sorceries at {0} cost when saddled, turning your discard pile into a repeatable spell engine.