Iridescent Drake, Unhallowed Pact, and Altar of Dementia

Prerequisites

• Iridescent Drake on the battlefield
• Unhallowed Pact on the battlefield
• Altar of Dementia on the battlefield
• Unhallowed Pact attached to Iridescent Drake

Steps

1. Activate Altar of Dementia by sacrificing Iridescent Drake
2. When Iridescent Drake dies, Unhallowed Pact triggers, returning Iridescent Drake from your graveyard to the battlefield
3. When Iridescent Drake enters the battlefield, it triggers, returning Unhallowed Pact from your graveyard to the battlefield attached to Iridescent Drake
4. Resolve the Altar of Dementia ability from step 1, 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
• Infinite self-mill