Underworld Breach, Altar of Dementia, and Pitiless Plunderer

Prerequisites

• Underworld Breach on the battlefield
• Altar of Dementia on the battlefield
• Pitiless Plunderer on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing the creature with power of 3 or greater
2. When the creature dies, Pitiless Plunderer triggers, creating a Treasure artifact token
3. Resolve the Altar of Dementia ability, causing you to mill cards equal to the creature's power
4. Activate the Treasure by tapping and sacrificing it, adding one mana of any color
5. Cast the creature from your graveyard by paying its mana cost plus exiling three other cards from your graveyard
6. Repeat

Results

• Near-infinite ETB
• Near-infinite storm count
• Near-infinite LTB
• Near-infinite death triggers
• Near-infinite sacrifice triggers
• Exile your library and graveyard