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

Prerequisites

• 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.

Steps

1. 1Cast Aura Finesse by paying , attaching Power Artifact to Codie and drawing a card.
2. 2Activate Codie by paying and tapping it, adding .
3. 3Activate Codie using the ability from Umbral Mantle by paying and untapping it, giving it +2/+2 until end of turn.
4. 4Repeat.
5. 5Once you have an arbitrarily large number of Codie triggers, you may cast any instant or sorcery spell by paying its mana cost.
6. 6Codie triggers for each time you activated its ability.
7. 7Resolve 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. 8Repeat step 7 for each remaining trigger.

Effects

• Cast a subset of spells in your library
• Infinite colored mana
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control
• Infinitely large creature until end of turn