Retreat to Coralhelm, Scaled Herbalist, and Ghost Town

Prerequisites

• Retreat to Coralhelm on the battlefield
• Scaled Herbalist on the battlefield
• Ghost Town in hand
• Scaled Herbalist does not have summoning sickness
• It is not your turn

Steps

1. During any opponent's turn, activate Scaled Herbalist by tapping it, putting Ghost Town from your hand onto the battlefield
2. Ghost Town enters the battlefield, triggering Retreat to Coralhelm, untapping Scaled Herbalist
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 colorless mana during each opponent's turn
• Infinite landfall triggers