Leonardo, Sewer Samurai + Solemnity + Phyrexian Altar + Phyrexian Walker

Leonardo, Sewer Samurai

Solemnity

Phyrexian Altar

Phyrexian Walker

How it works

1. Activate Phyrexian Altar 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.
4. Activate Phyrexian Altar by sacrificing the additional creature, adding one mana of any color.
5. Cast the creature from your graveyard by paying its mana cost. It will not enter with a finality counter on it due to Solemnity.
6. Repeat.

This elegant loop turns Leonardo, Sewer Samurai into a relentless graveyard recursion engine by leveraging its ability to cast 1-power or 1-toughness creatures from your graveyard—like the zero-mana Phyrexian Walker—right back onto the battlefield. Normally, Leonardo would burden those recurrent spells with finality counters, but Solemnity steps in to block all counters from ever being placed on your creatures, letting your fodder enter the fray completely unburdened. By feeding that same Phyrexian Walker directly into Phyrexian Altar, you sacrifice the creature to generate an endless supply of colored mana alongside infinite sacrifice, death, and entry triggers.