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

Prerequisites

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

Steps

1. Activate Goblin Bombardment by sacrificing the undying creature
2. When the creature dies, its undying ability triggers, returning the creature from your graveyard to the battlefield with a +1/+1 counter on it
3. Activate Goblin Bombardment by sacrificing the undying creature
4. When the creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
5. Resolve the Goblin Bombardment abilities from step 1 and 3
6. Repeat

Results

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