Retreat to Coralhelm, Walking Atlas, and Boros Garrison

Prerequisites

• Retreat to Coralhelm on the battlefield
• Walking Atlas on the battlefield
• Boros Garrison in hand
• Walking Atlas does not have summoning sickness

Steps

1. Activate Walking Atlas by tapping it, putting Boros Garrison from your hand onto the battlefield
2. Boros Garrison enters the battlefield, triggering itself and Retreat to Coralhelm
3. Resolve the Boros Garrison 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