Retreat to Coralhelm, Storm Cauldron, and PuPu UFO

Prerequisites

• Retreat to Coralhelm on the battlefield
• Storm Cauldron on the battlefield
• PuPu UFO on the battlefield

Steps

1. Activate PuPu UFO by tapping it, putting a land card from your hand onto the battlefield
2. When the land enters the battlefield, Retreat to Coralhelm triggers, untapping PuPu UFO
3. Activate the land by tapping it, adding
4. Storm Cauldron triggers, returning the land from your battlefield to your hand
5. Repeat

Results

• Infinite landfall triggers
• Infinite mana lands you control that enter the battlefield untapped can produce