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

Prerequisites

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

Steps

1. Activate Goblin Bombardment by sacrificing Pyreheart Wolf When Pyreheart Wolf dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
2. Resolve the Goblin Bombardment ability
3. Activate Goblin Bombardment by sacrificing Pyreheart Wolf When Pyreheart Wolf dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
4. Pyreheart Wolf enters and dies as a state-based action due to having 0 toughness
5. Its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
6. Resolve the Goblin Bombardment ability from step 4
7. Repeat from step 4

Results

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