Bladewing the Risen + Hellkite Courser + Goblin Bombardment

Steps

1. Cast Hellkite Courser by paying {4}{R}{R}.
2. When Hellkite Courser enters the battlefield, it triggers.
3. Holding priority, activate Goblin Bombardment by sacrificing Hellkite Courser, dealing 1 damage to any target.
4. Resolve the Hellkite Courser trigger, putting Bladewing the Risen from the command zone onto the battlefield.
5. When Bladewing the Risen enters the battlefield, it triggers.
6. Holding priority, activate Goblin Bombardment by sacrificing Bladewing the Risen.
7. Choose to return Bladewing the Risen to the command zone from your graveyard.
8. Resolve the Goblin Bombardment ability, dealing 1 damage to any target.
9. Resolve the Bladewing the Risen trigger from step 5, returning Hellkite Courser from your graveyard to the battlefield.
10. Repeat from step 2.