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

Mana needed: {4}{U}

WUBRG identity

Commander legal

The 4 combo pieces

What must be in place

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.

How to execute it

  1. Cast Aura Finesse by paying {U}, attaching Power Artifact to Codie and drawing a card.
  2. Activate Codie by paying {4} and tapping it, adding {W}{U}{B}{R}{G}.
  3. Activate Codie using the ability from Umbral Mantle by paying {1} 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.

What the combo produces