Retreat to Coralhelm + Cloudstone Curio + Murasa Rootgrazer

Retreat to Coralhelm

Cloudstone Curio

Murasa Rootgrazer

How it works

1. Activate a basic land by tapping it, adding 1.
2. Activate Murasa Rootgrazer's first ability by tapping it, putting a basic land from your hand onto the battlefield.
3. The land enters the battlefield, triggering Retreat to Coralhelm and Cloudstone Curio.
4. Resolve the Retreat to Coralhelm trigger, untapping Murasa Rootgrazer.
5. Resolve the Cloudstone Curio trigger, returning any other basic land from the battlefield to your hand.
6. Repeat.