Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Bartolomé del Presidio, and Arcbound Prototype

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Bartolomé del Presidio on the battlefield
• Arcbound Prototype on the battlefield

Steps

1. Activate Bartolomé del Presidio by sacrificing Arcbound Prototype
2. When Arcbound Prototype dies, its modular ability and persist ability trigger
3. Resolve the modular trigger, putting Arcbound Prototype's +1/+1 counters on another artifact creature
4. Resolve the persist trigger, returning Arcbound Prototype 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 Bartolomé del Presidio ability
7. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on artifact creatures you control
• Infinite +1/+1 counters on Bartolomé del Presidio