Koll, the Forgemaster + Goblin Bombardment + Shuko + Ornithopter

Koll, the Forgemaster

Goblin Bombardment

Shuko

Ornithopter

How it works

1. Activate Shuko's equip ability by paying 0, attaching it to Ornithopter.
2. Activate Goblin Bombardment by sacrificing Ornithopter.
3. When Ornithopter dies, Koll triggers, returning Ornithopter from your graveyard to your hand.
4. Resolve the Goblin Bombardment ability, dealing 1 damage to any target.
5. Cast Ornithopter by paying 0.
6. Repeat.

This loop turns free artifact momentum into infinite reach by weaponizing Koll, the Forgemaster's recursion clause. Since Shuko can be attached for zero mana, you can repeatedly equip it to Ornithopter before sacrificing the flyer to Goblin Bombardment. Because Ornithopter was equipped when it died, Koll, the Forgemaster triggers to bounce it right back to your hand for another free cast.