Patron of the Moon + Orzhov Basilica + Horizon Explorer

Patron of the Moon

Orzhov Basilica

Horizon Explorer

How it works

1. Pay 1 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.