Dominion Saboteur, Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, and Spawning Pit

Prerequisites

• Dominion Saboteur on the battlefield
• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Spawning Pit on the battlefield

Steps

1. Activate Spawning Pit by sacrificing Dominion Saboteur
2. When Dominion Saboteur dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. As it enters, choose to have it copy a creature you control that has a +1/+1 counter on it, so Dominion Saboteur will also enter with a +1/+1 counter on it
4. Resolve the Spawning Pit ability
5. Repeat

Results

• Infinite charge counters on a permanent
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers