Panoptic Mirror + Dramatic Reversal + Lithoform Engine

Panoptic Mirror

Dramatic Reversal

Lithoform Engine

How it works

1. At the beginning of your upkeep, Panoptic Mirror triggers.
2. Holding priority, activate any number of nonland permanents you control by tapping them, adding at least 2.
3. Activate Lithoform Engine's first ability by paying 2 and tapping it, copying Panoptic Mirror's trigger.
4. Resolve the copy of Panoptic Mirror's trigger, casting a copy of Dramatic Reversal without paying its mana cost.
5. Resolve the copy of Dramatic Reversal, untapping all nonland permanents you xontrol.
6. Repeat from step 2.
7. Cast Dramatic Reversal, holding priority.
8. Tap Lithoform Engine and spend 3 to activate the second ability of Lithoform Engine, copying Dramatic Reversal.
9. Allow the Dramatic Reversal copy to resolve, untapping your nonland permanents.
10. Tap your nonland mana sources for at least 4.
11. Repeat steps 2-4 for an infinite loop.