Cabal Coffers, Rings of Brighthearth, and Deserted Temple

Prerequisites

• Cabal Coffers on the battlefield
• Rings of Brighthearth on the battlefield
• Deserted Temple on the battlefield
• You control at least six Swamps
• available

Steps

1. Activate Cabal Coffers by paying and tapping it, adding for each Swamp you control
2. Activate Deserted Temple's second ability by paying and tapping it, targeting Cabal Coffers
3. Rings of Brighthearth triggers, causing you to pay to copy Deserted Temple's ability, targeting itself
4. Resolve both Deserted Temple abilities, untapping Deserted Temple and Cabal Coffers
5. Repeat

Results

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