Retreat to Coralhelm, Ghost Town, and Sakura-Tribe Scout

Prerequisites

• Retreat to Coralhelm on the battlefield
• Ghost Town in hand
• Sakura-Tribe Scout on the battlefield

Steps

1. During any opponent's turn, activate Sakura-Tribe Scout by tapping it, putting Ghost Town from your hand onto the battlefield
2. When Ghost Town enters the battlefield, Retreat to Coralhelm triggers, untapping Sakura-Tribe Scout
3. Activate Ghost Town's first ability by tapping it, adding
4. Activate Ghost Town's second ability by paying , returning it from the battlefield to your hand
5. Repeat

Results

• Infinite landfall triggers
• Infinite colorless mana during each opponent's turn