Remembrance + Mortuary + Phyrexian Walker + Phantom Train

Remembrance

Mortuary

Phyrexian Walker

Phantom Train

How it works

1. Activate Phantom Train 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 Phantom Train ability.
6. Cast Phyrexian Walker by paying 0.
7. Repeat.

This clever loop lets you feed Phantom Train an endless stream of fuel by treating your library and hand as a revolving door for Phyrexian Walker. Whenever you sacrifice the Walker to animate and grow the Train, Mortuary instantly intercepts it on the way to the graveyard to stack it neatly on top of your library. From there, Remembrance steps in to tutor another copy straight to your hand for zero mana, letting you recast Phyrexian Walker for free and do it all over again.