Boonweaver Giant + Goblin Bombardment + Unholy Indenture

Boonweaver Giant

Goblin Bombardment

Unholy Indenture

How it works

1. Activate Goblin Bombardment by sacrificing Boonweaver Giant
2. When Boonweaver Giant dies, Unholy Indenture triggers, returning Boonweaver Giant from your graveyard to the battlefield
3. When Boonweaver Giant enters, it triggers, returning Unholy Indenture from your graveyard to the battlefield attached to Boonweaver Giant.
4. Resolve the Goblin Bombardment ability from step 1.
5. Repeat.