Sakura-Tribe Scout + Dimir Aqueduct + Elven Raft-Steerer

Sakura-Tribe Scout

Dimir Aqueduct

Elven Raft-Steerer

How it works

1. Activate Sakura-Tribe Scout 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 Sakura-Tribe Scout.
5. Repeat.