Aura Finesse + Codie, Vociferous Codex + Chain Stasis + Power Artifact

Aura Finesse

Codie, Vociferous Codex

Chain Stasis

Power Artifact

How it works

1. Cast Aura Finesse by paying , attaching Power Artifact to Codie and drawing a card.
2. Cast Chain Stasis by paying , targeting Codie.
3. Holding priority, activate Codie by paying 2 and tapping it, adding .
4. Resolve Chain Stasis, untapping Codie and causing you to pay 2 to copy Chain Stasis, with the copy targeting Codie.
5. Repeat from step 2.
6. 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, reduced by the added in step 1.
7. Codie triggers for each time you activated its ability.
8. 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.
9. Repeat step 8 for each remaining trigger.