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

Prerequisites

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

Steps

1. Activate Goblin Bombardment by sacrificing Strangleroot Geist When Strangleroot Geist 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 Strangleroot Geist When Strangleroot Geist dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
4. Strangleroot Geist 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