How can you create a combo with Deserted Temple, Rings of Brighthearth, Gaea's Cradle?
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[START OF COMBO]This combo can be formed with Deserted Temple, Rings of Brighthearth, Gaea's Cradle

Color identity: G
Mana cost: 
Steps:
  1. Activate Gaea's Cradle by tapping it, adding at least {G}{G}{G}{G}.
  2. Activate Deserted Temple's second ability by paying {1} and tapping it, targeting Gaea's Cradle.
  3. Rings of Brighthearth triggers, causing you to pay {2} to copy Deserted Temple's ability, targeting Deserted Temple.
  4. Resolve both Deserted Temple abilities, untapping Deserted Temple and Gaea's Cradle.
  5. Repeat.
  6. Once you have infinite mana, you may untap any other lands you control in place of Gaea's Cradle.[END OF COMBO STEPS]

Result:
  - Infinite mana lands you control can produce
  - Infinite untap of lands you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You control at least four creatures.
[END OF COMBO PREREQUISITES]
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