Retreat to Coralhelm, Scaled Herbalist, and Selesnya Sanctuary

Prerequisites

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

Steps

1. Activate Scaled Herbalist by tapping it, putting Selesnya Sanctuary from your hand onto the battlefield
2. Selesnya Sanctuary enters the battlefield, triggering itself and Retreat to Coralhelm
3. Resolve the Selesnya Sanctuary 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