How can you create a combo with Murasa Rootgrazer, Retreat to Coralhelm, Yarok, the Desecrated?
user
[START OF COMBO]This combo can be formed with Murasa Rootgrazer, Retreat to Coralhelm, Yarok, the Desecrated

Color identity: GWUB
Mana cost: 
Steps:
  1. Tap Rootgrazer, putting a basic land into play.
  2. Retreat to Coralhelm triggers twice, in response, tap the basic for mana.
  3. Let the first Retreat trigger resolve, untapping Rootgrazer.
  4. Tap Rootgrazer, returning any basic you control to your hand.
  5. Let the second Retreat trigger resolve, untapping Rootgrazer.
  6. Repeat[END OF COMBO STEPS]

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

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