Remembrance + Mortuary + Goblin Bombardment + Ornithopter

Remembrance

Mortuary

Goblin Bombardment

Ornithopter

How it works

1. Activate Goblin Bombardment by sacrificing Ornithopter.
2. When Ornithopter dies, Mortuary and Remembrance trigger.
3. Resolve the Mortuary trigger, putting Ornithopter from your graveyard on top of your library.
4. Resolve the Remembrance trigger, searching your library for Ornithopter and putting it into your hand.
5. Resolve the Goblin Bombardment ability, dealing 1 damage to any target.
6. Cast Ornithopter by paying 0.
7. Repeat.