Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Altar of Dementia, and Arcbound Hybrid

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Altar of Dementia on the battlefield
• Arcbound Hybrid on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing Arcbound Hybrid
2. When Arcbound Hybrid dies, its modular ability and persist ability trigger
3. Resolve the modular trigger, putting Arcbound Hybrid's +1/+1 counters on another artifact creature
4. Resolve the persist trigger, returning Arcbound Hybrid from your graveyard to the battlefield
5. It will not have a -1/-1 counter on it due to its modular ability
6. Resolve the Altar of Dementia ability
7. Repeat

Results

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