Remembrance + Mortuary + Altar of Dementia + Phyrexian Walker

Remembrance

Mortuary

Altar of Dementia

Phyrexian Walker

How it works

1. Activate Altar of Dementia by sacrificing Phyrexian Walker.
2. When Phyrexian Walker dies, Mortuary and Remembrance trigger.
3. Resolve the Mortuary trigger, putting Phyrexian Walker from your graveyard on top of your library.
4. Resolve the Remembrance trigger, searching your library for Phyrexian Walker and putting it into your hand.
5. Resolve the Altar of Dementia ability.
6. Cast Phyrexian Walker by paying 0.
7. Repeat.

This clever zero-mana loop turns the humble Phyrexian Walker into an endless engine of sacrifice by turning its death into both a retrieval and a recycle. When you feed the artifact creature to Altar of Dementia, Mortuary catches it on its way to the graveyard to place it neatly on top of your library, while Remembrance simultaneously lets you tutor another copy straight to your hand. Because Phyrexian Walker costs zero mana to recast, you can simply play it again and repeat the process, letting you mill out any opponent's entire library through sheer repetition.