Mortuary, Pitiless Plunderer, Altar of Dementia, and Vivien, Monsters' Advocate

Prerequisites

• Mortuary on the battlefield
• Pitiless Plunderer on the battlefield
• Altar of Dementia on the battlefield
• Vivien, Monsters' Advocate on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing the nontoken creature
2. When the creature dies, Mortuary and Pitiless Plunderer trigger
3. Resolve the Mortuary trigger, putting the creature from your graveyard onto the top of your library
4. Resolve the Pitiless Plunderer trigger, creating a Treasure token
5. Resolve the Altar of Dementia ability
6. Activate the Treasure by tapping and sacrificing it, adding one mana of any color
7. Cast the creature from the top of your library by paying its mana cost Repeat

Results

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