Faceless One + Hamza, Guardian of Arashin + Myth Unbound + Mirage Mirror + Phantatog

Faceless One

Hamza, Guardian of Arashin

Myth Unbound

Mirage Mirror

Phantatog

How it works

1. Activate Mirage Mirror by paying 2, causing it to become a copy of Myth Unbound until end of turn.
2. Cast Faceless One from the command zone by paying 0.
3. Activate Phantatog's first ability by sacrificing Faceless One.
4. Choose to return Faceless One to the command zone from your graveyard.
5. Resolve the ability from step 3.
6. Repeat from step 2.

This clever loop turns the command zone into a self-sustaining engine by exploiting a quirk of Myth Unbound: since Mirage Mirror is currently a copy of Myth Unbound, casting Faceless One from the command zone triggers Myth Unbound's replacement effect to draw you a card whenever it's sent back. You then sacrifice Faceless One to Phantatog, sending it straight back to the command zone and letting you repeat the process completely free. While Hamza, Guardian of Arashin isn't strictly necessary for this specific loop to function, the entire chain yields infinite death triggers and commander casts that can easily be leveraged to overwhelm your opponents.