Murasa Rootgrazer + Retreat to Coralhelm + Yarok, the Desecrated

Murasa Rootgrazer

Retreat to Coralhelm

Yarok, the Desecrated

How it works

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