Quirion Ranger + Elvish Pioneer + Cloudstone Curio + Llanowar Tribe

Quirion Ranger

Elvish Pioneer

Cloudstone Curio

Llanowar Tribe

How it works

1. Activate Llanowar Tribe by tapping it, adding .
2. Cast Quirion Ranger by paying .
3. Quirion Ranger enters the battlefield, triggering Cloudstone Curio, returning Elvish Pioneer from the battlefield to your hand.
4. Activate Quirion Ranger by returning a basic Forest from the battlefield to your hand, untapping Llanowar Tribe.
5. Cast Elvish Pioneer by paying .
6. Elvish Pioneer enters the battlefield, triggering itself and Cloudstone Curio.
7. Resolve the Elvish Pioneer trigger, putting a basic Forest from your hand onto the battlefield tapped.
8. Resolve the Cloudstone Curio trigger, returning Quirion Ranger from the battlefield to your hand.
9. Repeat.