Walking Atlas + Dimir Aqueduct + Elven Raft-Steerer

Walking Atlas

Dimir Aqueduct

Elven Raft-Steerer

How it works

1. Activate Walking Atlas by tapping it, putting Dimir Aqueduct from your hand onto the battlefield.
2. When Dimir Aqueduct enters the battlefield, it and Elven Raft-Steerer trigger.
3. Resolve the Dimir Aqueduct trigger, returning itself from the battlefield to your hand.
4. Resolve the Elven Raft-Steerer trigger, untapping Walking Atlas.
5. Repeat.