Soratami Mirror-Mage, Retreat to Coralhelm, and PuPu UFO

Prerequisites

• Soratami Mirror-Mage on the battlefield
• Retreat to Coralhelm on the battlefield
• PuPu UFO on the battlefield

Steps

1. Activate three lands by tapping them, adding at least
2. Activate Soratami Mirror Mage by paying and returning the three lands from the battlefield to your hand
3. Holding priority, activate PuPu UFO by tapping it, putting a land from your hand onto the battlefield
4. When the land enters the battlefield, Retreat to Coralhelm triggers, untapping PuPu UFO
5. Repeat from step 3 two additional times
6. Repeat from step 1
7. Resolve all Soratami Mirror-Mage abilities, returning any number of creatures from the battlefield to their owners' hands

Results

• Infinite landfall triggers
• Return any number of creatures to their owner's hand
• Return any creature to its owner's hand when it enters the battlefield