Patron of the Moon + Tiller Engine + Golgari Rot Farm

Patron of the Moon

Tiller Engine

Golgari Rot Farm

How it works

1. Pay 1 to activate Patron of the Moon, putting Golgari Rot Farm from your hand onto the battlefield.
2. When Golgari Rot Farm enters, it and Tiller Engine each trigger.
3. Resolve Tiller Engine's ability, untapping Golgari Rot Farm.
4. Activate Golgari Rot Farm by tapping it, adding two mana.
5. Resolve Golgari Rot Farm's triggered ability, returning it from the battlefield to your hand.
6. Repeat.