Retreat to Coralhelm, Gruul Turf, and PuPu UFO

Prerequisites

• Retreat to Coralhelm on the battlefield
• Gruul Turf in hand
• PuPu UFO on the battlefield

Steps

1. Activate PuPu UFO by tapping it, putting Gruul Turf from your hand onto the battlefield
2. When Gruul Turf enters the battlefield, it and Retreat to Coralhelm trigger
3. Resolve the Gruul Turf trigger, returning itself from the battlefield to your hand
4. Resolve the Retreat to Coralhelm trigger, untapping PuPu UFO
5. Repeat

Results

• Infinite landfall triggers