Rings of Brighthearth, Deserted Temple, and Cabal Stronghold

Prerequisites

• Rings of Brighthearth on the battlefield
• Deserted Temple on the battlefield
• Cabal Stronghold on the battlefield
• available

Steps

1. Activate Cabal Stronghold by paying and tapping it, adding at least seven
2. Activate Deserted Temple's second ability by paying and tapping it, targeting Cabal Stronghold
3. Rings of Brighthearth triggers, causing you to pay to copy Deserted Temple's ability, targeting Deserted Temple
4. Resolve both Deserted Temple abilities, untapping Deserted Temple and Cabal Stronghold Repeat

Results

• Infinite untap of lands you control
• Infinite black mana
• Infinite mana lands you control can produce