Azorius Chancery + PuPu UFO + Elven Raft-Steerer

Azorius Chancery

PuPu UFO

Elven Raft-Steerer

How it works

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