Murasa Rootgrazer + Retreat to Coralhelm + Clever Impersonator

Murasa Rootgrazer

Retreat to Coralhelm

Clever Impersonator

How it works

1. Activate Murasa Rootgrazer's first ability, putting a basic land from your hand onto the battlefield.
2. The Retreat to Coralhelms trigger.
3. In response, activate the basic land by tapping it, adding 1.
4. Let the first Retreat to Coralhelm trigger resolve, untapping Murasa Rootgrazer.
5. Activate Murasa Rootgrazer's last ability, returning any basic land you control from the battlefield to your hand.
6. Let the second Retreat trigger resolve, untapping Murasa Rootgrazer.
7. Repeat.