Leonardo, Sewer Samurai + Solemnity + Goblin Bombardment + Ornithopter

Leonardo, Sewer Samurai

Solemnity

Goblin Bombardment

Ornithopter

How it works

1. Activate Goblin Bombardment 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 little loop uses Goblin Bombardment as a lethal outlet, turning the humble Ornithopter into endless ammo as it cycles from the battlefield straight to the graveyard. The real engine here is Leonardo, Sewer Samurai, whose static ability lets you recast that same Ornithopter right back out of your graveyard during your turn. Normally, doing this would slap a finality counter on the tiny flyer and exile it the moment it hits the bin again, but Solemnity steps in to shut that drawback down entirely by completely preventing counters from ever being placed on creatures.