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

Fiend Hunter

Phyrexian Delver

Verdant Sun's Avatar

Altar of Dementia

How it works

1. Cast Fiend Hunter by paying 1.
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.

This clever recursion loop relies on Fiend Hunter and Phyrexian Delver perpetually pulling one another back and forth between the battlefield, exile, and your graveyard. As they endlessly swap places, Verdant Sun's Avatar happily cushions your life total with a steady stream of life gain to offset the mana value costs paid to the Delver. Meanwhile, Altar of Dementia harnesses this violent revolving door to sacrifice Fiend Hunter on demand, turning the infinite cycle into a devastating engine that mills away your opponent's entire library.