Luminous Broodmoth, and Altar of Dementia

Prerequisites

• Luminous Broodmoth on the battlefield
• Altar of Dementia on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing the persist or undying creature
2. When the creature dies, its persist or undying ability triggers if it doesn't have a -1/-1 counter or +1/+1 counter on it respectively, and Luminous Broodmoth triggers if the creature didn't have flying
3. Resolve the persist or undying trigger, if applicable, returning the creature from your graveyard to the battlefield with either a -1/-1 counter or a +1/+1 counter on it
4. Resolve the Luminous Broodmoth trigger, if applicable, returning the creature from your graveyard to the battlefield with a flying counter on it if the creature is still in your graveyard
5. Resolve the Altar of Dementia ability
6. Repeat

Results

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