Leonardo, Sewer Samurai + Solemnity + Sarcatog + Phyrexian Walker

Leonardo, Sewer Samurai

Solemnity

Sarcatog

Phyrexian Walker

How it works

1. Activate Sarcatog 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 clever loop turns graveyard recycling into an engine by leveraging Solemnity to completely bypass the downside of Leonardo, Sewer Samurai. Because Solemnity prevents counters from being placed on creatures, you can repeatedly cast Phyrexian Walker from your graveyard for zero mana without acquiring the finality counter that would normally exile it upon death. Once the artifact creature hits the battlefield, Sarcatog steps in as the sacrifice outlet, letting you feed it to fuel its own pump ability while sending the Walker right back to the graveyard to do it all over again.