Zellix, Sanity Flayer + Haunted One + Pith Driller + Phyrexian Altar + Faces of the Past

Zellix, Sanity Flayer

Haunted One

Pith Driller

Phyrexian Altar

Faces of the Past

How it works

1. Activate Zellix by paying 1 and tapping it.
2. Haunted One triggers, causing all Horrors you control to get +2/+0 and undying until end of turn.
3. Resolve the Zellix ability, causing a player to mill three cards.
4. If the player milled a creature card this way, Zellix triggers, creating a 1/1 Horror creature token.
5. Activate Phyrexian Altar by sacrificing Pith Driller, adding 1.
6. When Pith Driller dies, its undying ability and Faces of the Past trigger.
7. Resolve the Pith Driller trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
8. When Pith Driller enters the battlefield, it triggers, putting a -1/-1 counter on it.
9. Resolve the Faces of the Past trigger, untapping all Horrors.
10. Repeat.

This intricate loop relies on the synergy between Zellix, Sanity Flayer and Haunted One to transform a simple mill into an engine of endless sacrifices and returns. By granting your Horrors undying, Haunted One ensures that when you feed Pith Driller to Phyrexian Altar, Pith Driller immediately resurrects with a +1/+1 counter—which is instantly neutralized by its own entry trigger, keeping the undying door wide open for the next iteration. Meanwhile, Faces of the Past exploits every single death to untap your Horrors, allowing Zellix, Sanity Flayer to keep activating and milling opponents until you unearth a creature that triggers a fresh token creation.