Retreat to Coralhelm, Scaled Herbalist, and Boros Garrison

Prerequisites

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

Steps

1. Activate Scaled Herbalist 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 Scaled Herbalist
5. Repeat

Results

• Infinite landfall triggers