Retreat to Coralhelm, Arid Archway, and Walking Atlas

Prerequisites

• Retreat to Coralhelm on the battlefield
• Arid Archway in hand
• Walking Atlas on the battlefield

Steps

1. Activate Walking Atlas by tapping it, putting Arid Archway from your hand onto the battlefield
2. When Arid Archway enters the battlefield, it and Retreat to Coralhelm trigger
3. Resolve the Arid Archway trigger, returning itself from the battlefield to your hand
4. Resolve the Retreat to Coralhelm trigger, untapping Walking Atlas
5. Repeat

Results

• Infinite landfall triggers