Voltaic Key + Rings of Brighthearth + Astral Cornucopia
Produces: Infinite untap of artifacts you control, Infinite colored mana, Infinite mana artifacts you control can produce
- Voltaic Key
- Rings of Brighthearth
- Astral Cornucopia
- Color identity
- C
Steps
- Activate Astral Cornucopia by tapping it, adding at least four mana of any color.
- Activate Voltaic Key by paying {1} and tapping it, targeting itself.
- Rings of Brighthearth triggers, causing you to pay {2} to copy Voltaic Key's ability, targeting Astral Cornucopia.
- Resolve both Voltaic Key abilities, untapping it and Astral Cornucopia.
- Repeat.