How can you create a combo with Karametra, God of Harvests, Shrieking Drake, Retreat to Coralhelm?
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[START OF COMBO]This combo can be formed with Karametra, God of Harvests, Shrieking Drake, Retreat to Coralhelm

Color identity: GWU
Mana cost: 
Steps:
  1. Activate a mana-producing creature by tapping it, adding at least {U}.
  2. Cast Shrieking Drake by paying {U}.
  3. Karametra triggers, causing you to search your library for a Forest or Plains and put it onto the battlefield tapped.
  4. When the Forest or Plains enters the battlefield, Retreat to Coralhelm triggers, untapping the mana-producing creature.
  5. Shrieking Drake enters the battlefield, returning itself from the battlefield to your hand.
  6. Repeat.[END OF COMBO STEPS]

Result:
  - Put all Forests and Plains from your library onto the battlefield tapped[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You control a creature that can tap to produce at least {U}.
[END OF COMBO PREREQUISITES]
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