Hashaton, Scarab's Fist + Mind Over Matter + Timeless Witness + The Eternity Elevator

Hashaton, Scarab's Fist

Mind Over Matter

Timeless Witness

The Eternity Elevator

How it works

1. Activate The Eternity Elevator by tapping it, adding at least twenty .
2. Activate Mind Over Matter by discarding Timeless Witness.
3. Hashaton triggers, causing you to pay 2 to create a tapped token copy of Timeless Witness that is a 4/4 Zombie.
4. When the Timeless Witness token enters the battlefield, it triggers, returning Timeless Witness from your graveyard to your hand.
5. Resolve the Mind Over Matter ability, untapping The Eternity Elevator.
6. Repeat.

This ingenious loop turns a massive burst of mana from The Eternity Elevator into an endless engine by leveraging Mind Over Matter as the ultimate discard outlet and untapper. Whenever you feed Timeless Witness into Mind Over Matter to untap your mana source, Hashaton, Scarab's Fist steps in to pay the {2}{U} fee and resurrect that discarded creature as a tapped 4/4 Zombie token. That newly minted token immediately triggers its own entry ability to return the original Timeless Witness right back to your hand, priming the entire sequence to repeat indefinitely.