Fiend Hunter, Phyrexian Delver, Verdant Sun's Avatar, and Altar of Dementia

Prerequisites

• Fiend Hunter in hand
• Phyrexian Delver on the battlefield
• Verdant Sun's Avatar on the battlefield
• Altar of Dementia on the battlefield
• available

Steps

1. Cast Fiend Hunter by paying
2. Fiend Hunter enters the battlefield, triggering its first ability and Verdant Sun's Avatar
3. Resolve the Verdant Sun's Avatar trigger, causing you to gain life equal to Fiend Hunter's toughness
4. Resolve the Fiend Hunter trigger, exiling Phyrexian Delver until Fiend Hunter leaves the battlefield
5. Activate Altar of Dementia by sacrificing Fiend Hunter
6. Fiend Hunter leaves the battlefield, triggering its second ability, returning Phyrexian Delver from exile to the battlefield
7. Phyrexian Delver enters the battlefield, triggering itself and Verdant Sun's Avatar
8. Resolve the Verdant Sun's Avatar trigger, causing you to gain life equal to Phyrexian Delver's toughness
9. Resolve the Phyrexian Delver trigger, returning Fiend Hunter from your graveyard to the battlefield and causing you to lose three life
10. Repeat from step 2
11. Resolve all Altar of Dementia abilities, causing target player(s) to mill infinite cards

Results

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