Patron of the Moon, Spelunking, and Gruul Turf

Prerequisites

• Patron of the Moon on the battlefield
• Spelunking on the battlefield
• Gruul Turf in hand
• available

Steps

1. Pay to activate Patron of the Moon, putting Gruul Turf from your hand onto the battlefield untapped due to Spelunking
2. When Gruul Turf enters, it triggers
3. Activate Gruul Turf by tapping it, adding two mana
4. Resolve Gruul Turf's triggered ability, returning it from the battlefield to your hand
5. Repeat

Results

• Infinite green mana
• Infinite landfall triggers
• Infinite red mana
• Infinite card draw
• Infinite draw triggers