Warbeast of Gorgoroth, Doubling Season, and Altar of Dementia

Prerequisites

• Warbeast of Gorgoroth on the battlefield
• Doubling Season on the battlefield
• Altar of Dementia on the battlefield
• You control another creature with power four or greater

Steps

1. Activate Altar of Dementia by sacrificing the creature with power four or greater
2. The creature dies, triggering Warbeast of Gorgoroth, 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 target player to mill cards equal to the sacrificed creature's power
4. Repeat

Results

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