Retreat to Coralhelm, Llanowar Scout, and Selesnya Sanctuary

Prerequisites

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

Steps

1. Activate Llanowar Scout 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 Llanowar Scout
5. Repeat

Results

• Infinite landfall triggers