Eternal Scourge, Ashnod's Altar, Mimic Vat, and Pawn of Ulamog

Prerequisites

• Eternal Scourge on the battlefield
• Ashnod's Altar on the battlefield
• Mimic Vat on the battlefield
• Pawn of Ulamog on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Eternal Scourge, adding
2. When Eternal Scourge dies, Pawn of Ulamog and Mimic Vat trigger
3. Resolve the Pawn of Ulamog trigger, creating a 0/1 Eldrazi Spawn creature token
4. Resolve the Mimic Vat trigger, exiling Eternal Scourge from your graveyard
5. Activate the Eldrazi Spawn by sacrificing it, adding
6. Cast Eternal Scourge from exile by paying
7. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count