Patron of the Moon + Tiller Engine + Dimir Aqueduct

Patron of the Moon

Tiller Engine

Dimir Aqueduct

How it works

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