Retreat to Coralhelm, Squandered Resources, Groundskeeper, and Walking Atlas

Prerequisites

• Retreat to Coralhelm on the battlefield
• Squandered Resources on the battlefield
• Groundskeeper on the battlefield
• Walking Atlas on the battlefield
• Walking Atlas does not have summoning sickness
• You control a basic Forest

Steps

1. Activate a basic Forest by tapping it, adding
2. Activate Squandered Resources by sacrificing a basic Forest, adding
3. Activate Groundskeeper by paying , 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

Results

• Infinite landfall triggers