Rakdos Carnarium + PuPu UFO + Elven Raft-Steerer

Rakdos Carnarium

PuPu UFO

Elven Raft-Steerer

How it works

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