Koll, the Forgemaster + Deathrender + Goblin Bombardment

Koll, the Forgemaster

Deathrender

Goblin Bombardment

How it works

1. Activate Goblin Bombardment by sacrificing the creature with Deathrender attached.
2. When the creature dies, Koll and Deathrender trigger.
3. Resolve the Koll trigger, returning the creature from your graveyard to your hand.
4. Resolve the Deathrender trigger, putting the creature from your hand onto the battlefield and attaching Deathrender to it.
5. Resolve the Goblin Bombardment ability from step 1, dealing 1 damage to any target.
6. Repeat.