Boonweaver Giant + Goblin Bombardment + Necrogen Communion

Boonweaver Giant

Goblin Bombardment

Necrogen Communion

How it works

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