Retreat to Coralhelm, Storm Cauldron, and Murasa Rootgrazer

Prerequisites

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

Steps

1. Activate Murasa Rootgrazer's first ability by tapping it, putting a basic land from your hand onto the battlefield
2. The land enters the battlefield, triggering Retreat to Coralhelm, untapping Murasa Rootgrazer
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