, : Add . When you next cast a spell this turn, exile cards from the top of your library until you exile an instant or sorcery card with lesser mana value. Until end of turn, you may cast that card without paying its mana cost. Put each other card exiled this way on the bottom of your library in a random order.
Codie forces a deck of only instants, sorceries, and lands (you can't cast permanents). Tap Codie for to make all five colors, then cast a cheap spell to dig and free-cast a higher-cost instant/sorcery, which itself can chain into the next free spell. The plan is to assemble a long chain of cantrips, rituals, and tutors in one turn that culminates in a lethal storm or game-ending spell.
Five-color access lets you run the best instants/sorceries across all colors
Chains of free casts generate huge value and explosive turns
Hard to interact with profitably since every card replaces itself or advances the chain
Commander is cheap (3 MV) and re-castable, providing reliable engine access
Cannot cast any permanents, so no creatures, mana rocks, or enchantments for ramp/defense
Extremely vulnerable to commander tax, artifact removal, and graveyard/Stax hate on Codie
Slow ground game; relies on lands and Codie alone for mana base
Activations require waiting a turn and getting each cycle, so early game is weak
Chains can fizzle if you flip an over-costed spell or run out of low-MV links
Classic storm finisher that drains the table once your chain count is high.
Add fast mana that isn't a permanent-only crutch—rituals like Dark Ritual, Pyretic Ritual, and Desperate Ritual fuel extra Codie activations and chain links. Tighten the curve so every instant/sorcery is a cheap cantrip or tutor that keeps chains alive, and add Underworld Breach plus a compact storm finisher for a deterministic kill. Premium duals, fetches, and on-color fast mana smooth the five-color base since you can't run mana rocks.