Leonardo, Sewer Samurai + Solemnity + Ravenous Intruder + Ornithopter

Leonardo, Sewer Samurai

Solemnity

Ravenous Intruder

Ornithopter

How it works

1. Activate Ravenous Intruder by sacrificing Ornithopter.
2. Cast Ornithopter 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 the graveyard into a recurring workshop, anchored by Solemnity to completely bypass the finality counters that Leonardo, Sewer Samurai would normally impose on spells cast from the graveyard. With that restriction nullified, you can endlessly cast Ornithopter for free, feeding it right into Ravenous Intruder's sacrifice ability. The result is an infinitely massive Ravenous Intruder alongside limitless leaves-the-battlefield, entry, sacrifice, and death triggers to fuel your victory.