Patron of the Moon, Golgari Rot Farm, and Tiller Engine

Prerequisites

• Patron of the Moon on the battlefield
• Golgari Rot Farm in hand
• Tiller Engine on the battlefield
• available

Steps

1. Pay to activate Patron of the Moon, putting Golgari Rot Farm from your hand onto the battlefield
2. When Golgari Rot Farm enters, it and Tiller Engine each trigger
3. Resolve Tiller Engine's ability, untapping Golgari Rot Farm
4. Activate Golgari Rot Farm by tapping it, adding two mana
5. Resolve Golgari Rot Farm's triggered ability, returning it from the battlefield to your hand
6. Repeat

Results

• Infinite black mana
• Infinite green mana
• Infinite landfall triggers