Patron of the Moon + Azorius Chancery + Horizon Explorer

Patron of the Moon

Azorius Chancery

Horizon Explorer

How it works

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