Leonardo, Sewer Samurai + Solemnity + Phyrexian Walker + Carrion Feeder

Leonardo, Sewer Samurai

Solemnity

Phyrexian Walker

Carrion Feeder

How it works

1. Activate Carrion Feeder by sacrificing Phyrexian Walker.
2. Cast Phyrexian Walker from your graveyard by paying 0. It will not enter with a finality counter on it due to Solemnity.
3. Repeat.

This cunning loop transforms the humble Phyrexian Walker into a perpetual sacrifice engine, fueled entirely by the graveyard-casting permission of Leonardo, Sewer Samurai. While Leonardo normally saddles creatures cast from the graveyard with a finality counter, Solemnity steps in as the ultimate safeguard to completely shut down those counters before they can ever touch the battlefield. This lets you endlessly recast the zero-mana artifact creature for free, feeding it directly to Carrion Feeder to generate boundless sacrifice triggers and grow your zombie to monumental proportions.