Retreat to Coralhelm, Llanowar Scout, and Simic Growth Chamber

Prerequisites

• Retreat to Coralhelm on the battlefield
• Llanowar Scout on the battlefield
• Simic Growth Chamber in hand
• Llanowar Scout does not have summoning sickness

Steps

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