Leonardo, Sewer Samurai + Solemnity + Megatog + Shield Sphere

Leonardo, Sewer Samurai

Solemnity

Megatog

Shield Sphere

How it works

1. Activate Megatog 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 clever sequence lets you feed your graveyard repeatedly into a monstrous engine. With Solemnity on the battlefield, its static ability prevents any counters from being placed, effectively shielding your creatures from both Leonardo, Sewer Samurai's finality counters and Shield Sphere's native -0/-1 counters. You can thus cast Shield Sphere for free from your graveyard over and over again, sacrificing it each time to Megatog to pump it infinitely large while generating endless sacrifice, entry, and leave-the-battlefield triggers.