Leonardo, Sewer Samurai + Solemnity + Phyrexian Walker + Yahenni, Undying Partisan

Leonardo, Sewer Samurai

Solemnity

Phyrexian Walker

Yahenni, Undying Partisan

How it works

1. Activate Yahenni 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 relies on Leonardo, Sewer Samurai to repeatedly pull zero-mana artifacts from the grave, transforming your graveyard into an endless supply chain. Phyrexian Walker provides the free, recurring sacrifice fodder needed to fuel Yahenni, Undying Partisan's sacrifice outlet. Normally, Leonardo would slap a finality counter on the Walker to exile it upon death, but Solemnity steps in to completely shut down counters from being placed on creatures. This interplay lets you endlessly cycle Phyrexian Walker back to the battlefield for free, generating an unstoppable storm count and infinite triggers.