Retreat to Coralhelm, Skyshroud Ranger, and Gruul Turf

Prerequisites

• Retreat to Coralhelm on the battlefield
• Skyshroud Ranger on the battlefield
• Gruul Turf in hand
• Skyshroud Ranger does not have summoning sickness

Steps

1. Activate Skyshroud Ranger by tapping it, putting Gruul Turf from your hand onto the battlefield
2. Gruul Turf enters the battlefield, triggering itself and Retreat to Coralhelm
3. Resolve the Gruul Turf 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