Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Blasting Station, and Butcher Ghoul

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Blasting Station on the battlefield
• Butcher Ghoul on the battlefield

Steps

1. Activate Blasting Station by tapping it and sacrificing Butcher Ghoul When Butcher Ghoul dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
2. When Butcher Ghoul enters, Blasting Station triggers, untapping Blasting Station
3. Resolve the Blasting Station ability from step 1
4. Activate Blasting Station by tapping it and sacrificing Butcher Ghoul When Butcher Ghoul dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
5. Butcher Ghoul enters and dies as a state-based action due to having 0 toughness
6. Its undying ability and Blasting Station trigger
7. Resolve the undying trigger, returning Butcher Ghoul from your graveyard to the battlefield with a +1/+1 counter on it
8. When Butcher Ghoul enters, Blasting Station triggers
9. Resolve both triggers from this step and step 7, untapping Blasting Station
10. Resolve the Blasting Station ability from step 5
11. Repeat from step 5

Results

• Infinite ETB
• Infinite LTB
• Infinite damage
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control