Retreat to Coralhelm + Squandered Resources + Groundskeeper + Walking Atlas

Retreat to Coralhelm

Squandered Resources

Groundskeeper

Walking Atlas

How it works

1. Activate a basic Forest by tapping it, adding .
2. Activate Squandered Resources by sacrificing a basic Forest, adding .
3. Activate Groundskeeper by paying 1, causing you to put the basic Forest from your graveyard into your hand.
4. Activate Walking Atlas by tapping it, putting the basic Forest onto the battlefield from your hand.
5. The Forest enters the battlefield, triggering Retreat to Coralhelm, untapping Walking Atlas.
6. Repeat.