Disa the Restless + Altar of Dementia + Arcane Adaptation + Avenging Angel

Disa the Restless

Altar of Dementia

Arcane Adaptation

Avenging Angel

How it works

1. Activate Altar of Dementia by sacrificing Avenging Angel.
2. When Avenging Angel dies, it triggers, putting itself from your graveyard onto the top of your library.
3. Resolve the Altar of Dementia ability, causing you to mill cards equal to Avenging Angel's power, which will cause you to mill Avenging Angel.
4. As Avenging Angel is a Lhurgoyf due to Arcane Adaptation, Disa's first ability triggers, returning Avenging Angel from your graveyard to the battlefield.
5. Repeat.