Retreat to Coralhelm, Storm Cauldron, and Scaled Herbalist

Prerequisites

• Retreat to Coralhelm on the battlefield
• Storm Cauldron on the battlefield
• Scaled Herbalist on the battlefield
• You have a basic land in hand
• Scaled Herbalist does not have summoning sickness

Steps

1. Activate Scaled Herbalist by tapping it, putting a basic land from your hand onto the battlefield
2. The land enters the battlefield, triggering Retreat to Coralhelm, untapping Scaled Herbalist
3. Activate the basic land by tapping it, adding
4. Storm Cauldron triggers, returning the basic land from your battlefield to your hand
5. Repeat

Results

• Infinite landfall triggers
• Infinite mana basic lands you control can produce