Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Blasting Station, and Cryptborn Horror

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Blasting Station on the battlefield
• Cryptborn Horror on the battlefield

Steps

1. Activate Blasting Station by tapping it and sacrificing Cryptborn Horror
2. When Cryptborn Horror dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to its replacement effect
3. When Cryptborn Horror enters, Blasting Station triggers, untapping Blasting Station
4. Resolve the Blasting Station ability from step 1
5. Repeat

Results

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