Simic Growth Chamber + PuPu UFO + Elven Raft-Steerer

Simic Growth Chamber

PuPu UFO

Elven Raft-Steerer

How it works

1. Activate PuPu UFO 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 PuPu UFO.
5. Repeat.