Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Grim Poppet, and Extruder

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Grim Poppet on the battlefield
• Extruder on the battlefield

Steps

1. If Grim Poppet has any -1/-1 counters on it, activate it by removing a -1/-1 counter from it
2. Repeat step 1 as necessary until Grim Poppet has no -1/-1 counters on it
3. Activate Extruder by sacrificing Grim Poppet
4. When Grim Poppet dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
5. Resolve the Extruder ability
6. Repeat
7. Resolve all Grim Poppet abilities, putting infinite -1/-1 counters on any number of creatures

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters
• Destroy all creatures that enter the battlefield under an opponent's control
• Destroy any number of creatures
• Infinite -1/-1 counters