Llanowar Scout + Simic Growth Chamber + Elven Raft-Steerer

Llanowar Scout

Simic Growth Chamber

Elven Raft-Steerer

How it works

1. Activate Llanowar Scout by tapping it, putting Simic Growth Chamber from your hand onto the battlefield.
2. When Simic Growth Chamber enters the battlefield, it and Elven Raft-Steerer trigger.
3. Resolve the Simic Growth Chamber trigger, returning itself from the battlefield to your hand.
4. Resolve the Elven Raft-Steerer trigger, untapping Llanowar Scout.
5. Repeat.