Arid Archway, PuPu UFO, and Elven Raft-Steerer

Prerequisites

• Arid Archway in hand
• PuPu UFO on the battlefield
• Elven Raft-Steerer on the battlefield

Steps

1. Activate PuPu UFO by tapping it, putting Arid Archway from your hand onto the battlefield
2. When Arid Archway enters the battlefield, it and Elven Raft-Steerer trigger
3. Resolve the Arid Archway trigger, returning itself from the battlefield to your hand
4. Resolve the Elven Raft-Steerer trigger, untapping PuPu UFO
5. Repeat

Results

• Infinite landfall triggers