Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Grinding Station, and Arcbound Lancer

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Grinding Station on the battlefield
• Arcbound Lancer on the battlefield

Steps

1. Activate Grinding Station by tapping it and sacrificing Arcbound Lancer
2. When Arcbound Lancer dies, its modular ability and persist ability trigger
3. Resolve the modular trigger, putting Arcbound Lancer's +1/+1 counters on another artifact creature
4. Resolve the persist trigger, returning Arcbound Lancer from your graveyard to the battlefield
5. It will not have a -1/-1 counter on it due to its modular ability
6. When Arcbound Lancer enters, Grinding Station triggers, untapping Grinding Station
7. Resolve the Grinding Station ability from step 1
8. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite mill
• Infinite self-mill
• Infinite +1/+1 counters on certain creatures