Codie, Vociferous Codex + Chain Stasis + Agatha of the Vile Cauldron

Codie, Vociferous Codex

Chain Stasis

Agatha of the Vile Cauldron

How it works

1. Cast Chain Stasis by paying , targeting Codie.
2. Holding priority, activate Codie by paying at most 2 and tapping it, adding .
3. Resolve Chain Stasis, untapping Codie and causing you to pay 2 to copy Chain Stasis, with the copy targeting Codie.
4. Repeat from step 2.
5. Once you have an arbitrarily large number of Codie triggers, you may choose not to copy Chain Stasis and cast any instant or sorcery by paying its mana cost.
6. Codie triggers for each time you activated its ability.
7. 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.
8. Repeat step 6 for each remaining trigger.
9. You may also repeat this combo for each instant and sorcery card in your hand as mana permits, and on subsequent turns.

This loop relies on Codie, Vociferous Codex as both a mana source and a massive cascade trigger, turning the modest untap ability of Chain Stasis into an engine of overwhelming value. By using Agatha of the Vile Cauldron to discount Codie's ability down to just two generic mana, you can infinitely loop Chain Stasis to untap Codie, endlessly generating five-color mana and stacking up triggers. Once you stop copying Chain Stasis, every single activation of Codie cascades through your library to cast your spells completely free.