Iridescent Drake, Kaya's Ghostform, and Altar of Dementia

Prerequisites

• Iridescent Drake on the battlefield
• Kaya's Ghostform on the battlefield
• Altar of Dementia on the battlefield
• Kaya's Ghostform attached to Iridescent Drake

Steps

1. Activate Altar of Dementia by sacrificing Iridescent Drake
2. Kaya's Ghostform triggers, returning Iridescent Drake to the battlefield
3. Iridescent Drake enters the battlefield, returning Kaya's Ghostform from your graveyard to the battlefield attached to Iridescent Drake
4. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Iridescent Drake's power
5. Repeat

Results

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