Nim Deathmantle, Dockside Extortionist, and Altar of Dementia

Prerequisites

• Nim Deathmantle on the battlefield
• Dockside Extortionist on the battlefield
• Altar of Dementia on the battlefield
• Opponents control at least five artifacts and/or enchantments
• available

Steps

1. Activate Altar of Dementia by sacrificing Dockside Extortionist
2. When Dockside Extortionist dies, Nim Deathmantle triggers, causing you to pay to return Dockside Extortionist from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. When Dockside Extortionist enters the battlefield, it triggers, creating at least five Treasure tokens
4. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to Dockside Extortionist's power
5. Activate four Treasures by tapping and sacrificing them, adding
6. Repeat

Results

• Infinite colored mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill
• Infinite Treasure tokens