Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Ravenous Intruder, and Arcbound Slasher

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Ravenous Intruder on the battlefield
• Arcbound Slasher on the battlefield

Steps

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

Results

• Infinitely large creature until end of turn
• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on certain creatures