How can you create a combo with Retreat to Coralhelm, Scaled Herbalist, Oboro, Palace in the Clouds?
user
[START OF COMBO]This combo can be formed with Retreat to Coralhelm, Scaled Herbalist, Oboro, Palace in the Clouds

Color identity: GU
Mana cost: 
Steps:
  1. Activate Scaled Herbalist by tapping it, putting Oboro from your hand onto the battlefield.
  2. Oboro enters the battlefield, triggering Retreat to Coralhelm, untapping Scaled Herbalist.
  3. Activate Oboro's first ability by tapping it, adding {U}.
  4. Activate Oboro's second ability by paying {1}, returning it from the battlefield to your hand.
  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
  - Scaled Herbalist must be on the battlefield
  - Oboro, Palace in the Clouds must be in your hand
  - Scaled Herbalist does not have summoning sickness.
[END OF COMBO PREREQUISITES]
assistant