Muldrotha, the Gravetide, Kaya's Ghostform, Altar of Dementia, and Pitiless Plunderer

Prerequisites

• Muldrotha, the Gravetide on the battlefield
• Kaya's Ghostform on the battlefield
• Altar of Dementia on the battlefield
• Pitiless Plunderer on the battlefield
• Kaya's Ghostform attached to Muldrotha

Steps

1. Activate Altar of Dementia by sacrificing Muldrotha
2. Kaya's Ghostform and Pitiless Plunderer triggers
3. Resolve the Kaya's Ghostform's trigger, returning Muldrotha to the battlefield
4. Resolve the Pitiless Plunderer's trigger, creating a Treasure token
5. Resolve the Altar of Dementia's ability, causing target player to mill six cards
6. Activate Treasure token by tapping and sacrificing it, adding
7. Cast Kaya's Ghostform from your graveyard by paying , targeting Muldrotha
8. Repeat

Results

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