Voltaic Key, Rings of Brighthearth, and Everflowing Chalice

Prerequisites

• Voltaic Key on the battlefield
• Rings of Brighthearth on the battlefield
• Everflowing Chalice on the battlefield
• Everflowing Chalice has 4 or more charge counters on it

Steps

1. Activate Everflowing Chalice to add to your mana pool
2. Activate Voltaic Key to untap Everflowing Chalice
3. Rings of Brighthearth triggers allowing you to copy Voltaic Key's ability and untap Voltaic key with the copy
4. Repeat

Results

• Infinite colorless mana
• Infinite untap of all artifacts you control