Muldrotha, the Gravetide, Kaya's Ghostform, Altar of Dementia, and Lotus Petal

Prerequisites

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

Steps

1. Activate Altar of Dementia by sacrificing Muldrotha
2. Kaya's Ghostform triggers, returning Muldrotha to the battlefield
3. Resolve the Altar of Dementia's ability, causing target player to mill six cards
4. Activate Lotus Petal by sacrificing it, adding
5. Cast Kaya's Ghostform from your graveyard by paying , targeting Muldrotha
6. Cast Lotus Petal from your graveyard by paying
7. Repeat

Results

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