Koll, the Forgemaster + Mask of Immolation + Fighter Class + Ornithopter

Koll, the Forgemaster

Mask of Immolation

Fighter Class

Ornithopter

How it works

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