How can you create a combo with Retreat to Coralhelm, Cloudstone Curio, Murasa Rootgrazer?
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[START OF COMBO]This combo can be formed with Retreat to Coralhelm, Cloudstone Curio, Murasa Rootgrazer

Color identity: GWU
Mana cost: 
Steps:
  1. Activate a basic land by tapping it, adding {1}.
  2. Activate Murasa Rootgrazer's first ability by tapping it, putting a basic land from your hand onto the battlefield.
  3. The land enters the battlefield, triggering Retreat to Coralhelm and  Cloudstone Curio.
  4. Resolve the Retreat to Coralhelm trigger, untapping Murasa Rootgrazer.
  5. Resolve the Cloudstone Curio trigger, returning any other basic land from the battlefield to your hand.
  6. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite landfall triggers
  - Infinite mana basic lands you control can produce[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You have basic land card in hand.
  - You control at least one basic land.
  - Murasa Rootgrazer does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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