Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Goblin Bombardment, and Clockwork Hydra

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Goblin Bombardment on the battlefield
• Clockwork Hydra on the battlefield

Steps

1. Activate Goblin Bombardment by sacrificing Clockwork Hydra
2. When Clockwork Hydra dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to its replacement effect
3. Resolve the Goblin Bombardment ability
4. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite damage
• Infinite death triggers
• Infinite sacrifice triggers