Codie, Vociferous Codex + Galvanic Alchemist + Biomancer's Familiar

Codie, Vociferous Codex

Galvanic Alchemist

Biomancer's Familiar

How it works

1. Activate Codie by paying 2 and tapping it, adding .
2. Activate Codie by paying , untapping it.
3. Repeat.
4. Once you have an arbitrarily large number of Codie triggers, you may cast any instant or sorcery spell by paying its mana cost.
5. Codie triggers for each time you activated its ability.
6. Resolve the first trigger, causing you to exile cards from the top of your library until you exile an instant or sorcery spell with lesser mana value, and allowing you to cast that spell without paying its mana cost.
7. Repeat step 6 for each remaining trigger.
8. You may also repeat this combo for each instant and/or sorcery card in your hand, and on subsequent turns.

This clever loop centers on turning Codie, Vociferous Codex's high-mana activation into a repeatable engine with the help of Biomancer's Familiar, which discounts the untap ability down to just one blue mana. By soulbonding Galvanic Alchemist to Codie, Vociferous Codex, the Alchemist grants the exact untap activation needed to continually re-tap Codie for WUBRG. Thanks to Biomancer's Familiar making that untap cheap enough to loop infinitely, you can rack up an arbitrary number of Codie, Vociferous Codex triggers that will eventually let you cascade through and cast every instant and sorcery in your library for free.