Aeon Engine + Master Transmuter + Unwinding Clock + Mirrorworks

Aeon Engine

Master Transmuter

Unwinding Clock

Mirrorworks

How it works

1. Cast Aeon Engine by paying 5.
2. Aeon Engine enters the battlefield, triggering Mirrorworks, causing you to pay 2 to create a copy of Aeon Engine.
3. Activate Master Transmuter by paying and tapping it, returning Aeon Engine to your hand.
4. Pass the turn.
5. Untap all permanents you control during each opponent's untap step due to Unwinding Clock.
6. Activate the token copy of Aeon Engine by tapping and exiling it, reversing the game order.
7. On your turn, repeat from step 1.