Codie, Vociferous Codex + Umbral Mantle + Biomancer's Familiar

Prerequisites

• Codie does not have summoning sickness.
• Umbral Mantle attached to Codie.

Steps

1. 1Activate Codie by paying and tapping it, adding .
2. 2Activate Codie by paying and untapping it, giving it +2/+2 until end of turn.
3. 3Repeat.
4. 4Once you have an arbitrarily large number of Codie triggers, you may cast any instant or sorcery spell by paying its mana cost.
5. 5Codie triggers for each time you activated its ability.
6. 6Resolve 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. 7Repeat step 6 for each remaining trigger.
8. 8You may also repeat this combo for each instant and/or sorcery card in your hand, and on subsequent turns.

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