Retreat to Coralhelm, Guildless Commons, and PuPu UFO

Prerequisites

• Retreat to Coralhelm on the battlefield
• Guildless Commons in hand
• PuPu UFO on the battlefield

Steps

1. Activate PuPu UFO by tapping it, putting Guildless Commons from your hand onto the battlefield
2. When Guildless Commons enters the battlefield, it and Retreat to Coralhelm trigger
3. Resolve the Guildless Commons 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