Patron of the Moon, Orzhov Basilica, and Horizon Explorer

Prerequisites

• Patron of the Moon on the battlefield
• Orzhov Basilica in hand
• Horizon Explorer on the battlefield
• available

Steps

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

Results

• Infinite black mana
• Infinite landfall triggers
• Infinite white mana