Leonardo, Sewer Samurai + Solemnity + Megatog + Ornithopter

Leonardo, Sewer Samurai

Solemnity

Megatog

Ornithopter

How it works

1. Activate Megatog 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 recursion engine transforms Solemnity from a simple defensive enchantment into the ultimate countermeasure against Leonardo, Sewer Samurai's finality restriction. With Solemnity on the battlefield preventing counters from ever being placed, Leonardo, Sewer Samurai allows you to repeatedly cast Ornithopter for free straight from your graveyard every time it hits the bin. To fuel the loop, you simply feed that same Ornithopter to Megatog's sacrifice ability, pumping Megatog into an infinitely massive, trampling threat while generating an endless chain of artifact sacrifices and creature deaths.