Codie, Vociferous Codex, High Alert, and Agatha of the Vile Cauldron

Prerequisites

• Codie, Vociferous Codex on the battlefield
• High Alert on the battlefield
• Agatha of the Vile Cauldron on the battlefield
• Codie does not have summoning sickness
• Agatha of the Vile Cauldron has power 3 or greater
• available

Steps

1. Activate Codie by paying and tapping it, adding
2. Activate High Alert by paying , untapping Codie
3. Repeat as desired, skipping step 2 on the final iteration
4. Once you have an arbitrarily large number of Codie triggers, cast any spell by paying its mana cost, reduced by the added in step 1
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 as mana permits, and on subsequent turns

Results

• Cast all instants and sorceries in your library with mana value less than spells you cast