Patron of the Moon + Gruul Turf + Horizon Explorer

Patron of the Moon

Gruul Turf

Horizon Explorer

How it works

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