How can you create a combo with Rings of Brighthearth, Deserted Temple, Scorched Ruins?
user
[START OF COMBO]This combo can be formed with Rings of Brighthearth, Deserted Temple, Scorched Ruins

Color identity: C
Mana cost: 
Steps:
  1. Activate Scorched Ruins by tapping it, adding {C}{C}{C}{C}.
  2. Activate Deserted Temple's second ability by paying {1} and tapping it, targeting Scorched Ruins.
  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 Scorched Ruins.
  5. Repeat an arbitrarily large number of times.
  6. Once you have a large amount of {C}, you may untap any other lands you control in place of Scorched Ruins.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - 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
[END OF COMBO PREREQUISITES]
assistant