Quirion Ranger + Elvish Pioneer + Cloudstone Curio + Circle of Dreams Druid

Quirion Ranger

Elvish Pioneer

Cloudstone Curio

Circle of Dreams Druid

How it works

1. Cast Quirion Ranger by paying .
2. Quirion Ranger enters the battlefield, triggering Cloudstone Curio.
3. Holding priority, activate Circle of Dreams Druid by tapping it, adding at least .
4. Resolve the Cloudstone Curio trigger, returning Elvish Pioneer from the battlefield to your hand.
5. Activate Quirion Ranger by returning a basic Forest from the battlefield to your hand, untapping Circle of Dreams Druid.
6. Cast Elvish Pioneer by paying .
7. Elvish Pioneer enters the battlefield, triggering itself and Cloudstone Curio.
8. Resolve the Elvish Pioneer trigger, putting a basic Forest from your hand onto the battlefield tapped.
9. Resolve the Cloudstone Curio trigger, returning Quirion Ranger from the battlefield to your hand.
10. Repeat.