Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Blasting Station, and Vengeful Vampire

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Blasting Station on the battlefield
• Vengeful Vampire on the battlefield

Steps

1. Activate Blasting Station by tapping it and sacrificing Vengeful Vampire When Vengeful Vampire dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
2. When Vengeful Vampire enters, Blasting Station triggers, untapping Blasting Station
3. Activate Blasting Station by tapping it and sacrificing Vengeful Vampire When Vengeful Vampire dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
4. When Vengeful Vampire enters, Blasting Station triggers, untapping Blasting Station
5. Resolve the Blasting Station abilities from step 1 and 4
6. Repeat

Results

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