Patron of the Moon + Guildless Commons + Horizon Explorer

Patron of the Moon

Guildless Commons

Horizon Explorer

How it works

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