Leonardo, Sewer Samurai + Solemnity + Arcbound Ravager + Shield Sphere

Leonardo, Sewer Samurai

Solemnity

Arcbound Ravager

Shield Sphere

How it works

1. Activate Arcbound Ravager by sacrificing Shield Sphere.
2. Cast Shield Sphere from your graveyard by paying 0. It will not enter with a finality counter on it due to Solemnity.
3. Repeat.

This loop turns your graveyard into an infinite recycling plant by leveraging Leonardo, Sewer Samurai's ability to let you cast creatures with power or toughness 1 or less—such as Shield Sphere—right out of your graveyard. Ordinarily, those creatures would enter with a dreaded finality counter, but Solemnity steps in as a passive savior to prevent any counters from being placed on creatures entirely. Meanwhile, Arcbound Ravager provides the mechanical engine to chew up the zero-mana Shield Sphere for parts, feeding its own modular growth and triggering endless sacrifices.