Patron of the Moon, Spelunking, and Rakdos Carnarium

Prerequisites

• Patron of the Moon on the battlefield
• Spelunking on the battlefield
• Rakdos Carnarium in hand
• available

Steps

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

Results

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