Retreat to Coralhelm, Skyshroud Ranger, and Simic Growth Chamber

Prerequisites

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

Steps

1. Activate Skyshroud Ranger 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 Skyshroud Ranger
5. Repeat

Results

• Infinite landfall triggers