How can you create a combo with Retreat to Coralhelm, Walking Atlas, Orzhov Basilica?
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[START OF COMBO]This combo can be formed with Retreat to Coralhelm, Walking Atlas, Orzhov Basilica

Color identity: WUB
Mana cost: 
Steps:
  1. Activate Walking Atlas by tapping it, putting Orzhov Basilica from your hand onto the battlefield.
  2. Orzhov Basilica enters the battlefield, triggering itself and Retreat to Coralhelm.
  3. Resolve the Orzhov Basilica trigger, returning itself from the battlefield to your hand.
  4. Resolve the Retreat to Coralhelm trigger, untapping Walking Atlas.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite landfall triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Retreat to Coralhelm must be on the battlefield
  - Walking Atlas must be on the battlefield
  - Orzhov Basilica must be in your hand
  - Walking Atlas does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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