Codie, Vociferous Codex, Aura Finesse, Umbral Mantle, and Power Artifact

Prerequisites

• Codie, Vociferous Codex on the battlefield
• Aura Finesse in hand
• Umbral Mantle on the battlefield
• Power Artifact on the battlefield
• Codie does not have summoning sickness
• Umbral Mantle attached to Codie
• Power Artifact attached to any artifact
• Any additional nonpermanent card in hand with mana to cast it
• available

Steps

1. Cast Aura Finesse by paying , attaching Power Artifact to Codie and drawing a card
2. Activate Codie by paying and tapping it, adding
3. Activate Codie using the ability from Umbral Mantle by paying and untapping it, giving it +2/+2 until end of turn
4. Repeat
5. Once you have an arbitrarily large number of Codie triggers, you may cast any instant or sorcery spell 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 7 for each remaining trigger

Results

• Infinite colored mana
• Cast all instants and sorceries in your library with mana value less than spells you cast
• Infinitely large Codie until end of turn