Warbeast of Gorgoroth, Altar of Dementia, and Primal Vigor

Prerequisites

• Warbeast of Gorgoroth on the battlefield
• Altar of Dementia on the battlefield
• Primal Vigor on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing the creature with power 4 or greater
2. When the creature dies, Warbeast of Gorgoroth triggers, creating a 0/0 Army creature token if you don't control one, then putting four +1/+1 counters on an Army you control
3. Resolve the Altar of Dementia ability, causing a player to mill card(s) Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite mill
• Infinite self-mill