Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Grinding Station, and Threefold Thunderhulk

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Grinding Station on the battlefield
• Threefold Thunderhulk on the battlefield

Steps

1. Activate Grinding Station by sacrificing Threefold Thunderhulk
2. When Threefold Thunderhulk 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 Threefold Thunderhulk enters, Grinding Station triggers, untapping itself
4. Resolve the Grinding Station ability from step 1, causing target player to mill three cards
5. Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature tokens
• Infinite death triggers
• Infinite mill
• Infinite creature sacrifice triggers
• Infinite self-mill
• Infinite artifact ETB
• Infinite artifact LTB
• Infinite artifact sacrifice triggers