Selesnya Sanctuary + PuPu UFO + Elven Raft-Steerer

Selesnya Sanctuary

PuPu UFO

Elven Raft-Steerer

How it works

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