Retreat to Coralhelm, Llanowar Scout, and Guildless Commons

Prerequisites

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

Steps

1. Activate Llanowar Scout by tapping it, putting Guildless Commons from your hand onto the battlefield
2. Guildless Commons enters the battlefield, triggering itself and Retreat to Coralhelm
3. Resolve the Guildless Commons 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