Leonardo, Sewer Samurai + Solemnity + Grinding Station + Memnite

Leonardo, Sewer Samurai

Solemnity

Grinding Station

Memnite

How it works

1. Activate Grinding Station by tapping it and sacrificing Memnite.
2. Cast Memnite from your graveyard by paying 0. It will not enter with a finality counter on it due to Solemnity.
3. When Memnite enters, Grinding Station triggers, untapping Grinding Station.
4. Repeat.

This ingenious loop turns a humble zero-mana creature into an endless engine of mill and sacrifice. With Solemnity on the battlefield acting as a preventative shield, Leonardo, Sewer Samurai's graveyard-casting ability bypasses the drawback of finality counters entirely, allowing you to recast Memnite over and over again from your graveyard. Each time Memnite returns, its entry triggers Grinding Station to untap, providing the fresh artifact needed to sacrifice and repeat the cycle indefinitely until your opponents' libraries are entirely gone.