Mortuary + Woe Strider + Phyrexian Walker + Gwenom, Remorseless

Mortuary

Woe Strider

Phyrexian Walker

Gwenom, Remorseless

How it works

1. Activate Woe Strider by sacrificing Phyrexian Walker
2. When Phyrexian Walker dies, Mortuary triggers, putting Phyrexian Walker from your graveyard onto the top of your library.
3. Resolve the Woe Strider ability.
4. Cast Phyrexian Walker from the top of your library by paying 0 life.
5. Repeat.

This loop turns a seemingly harmless artifact creature into an engine for infinite triggers by exploiting the top-of-library manipulation granted by Mortuary. When Woe Strider sacrifices Phyrexian Walker, Mortuary catches it on the way to the graveyard and neatly stacks it right back on top of your library. From there, Gwenom, Remorseless steps in to let you cast that free artifact right back off the top of your library without spending actual mana, letting you repeat the whole cycle for infinite deaths, sacrifices, and scry triggers.