Rakdos, Lord of Riots + Myr Retriever + Junk Diver + Goblin Bombardment

Rakdos, Lord of Riots

Myr Retriever

Junk Diver

Goblin Bombardment

How it works

1. Activate Goblin Bombardment by sacrificing Junk Diver.
2. When Junk Diver dies, it triggers, returning Myr Retriever from your graveyard to your hand.
3. Resolve the Goblin Bombardment ability, dealing 1 damage to an opponent.
4. Cast Myr Retriever by paying 0.
5. Activate Goblin Bombardment by sacrificing Myr Retriever.
6. When Myr Retriever dies, it triggers, returning Junk Diver from your graveyard to your hand.
7. Resolve the Goblin Bombardment ability, dealing 1 damage to an opponent.
8. Cast Junk Diver by paying 0.
9. Repeat.