Cromat + Minn, Wily Illusionist + Fool's Demise + Altar of Dementia

Cromat

Minn, Wily Illusionist

Fool's Demise

Altar of Dementia

How it works

1. Activate Altar of Dementia by sacrificing Cromat.
2. Cromat dies, triggering Minn's second ability and Fool's Demise's first and second abilities.
3. Resolve the second Fool's Demise trigger, returning it from your graveyard to your hand.
4. Resolve the first Fool's Demise trigger, returning Cromat from your graveyard to the battlefield.
5. Resolve the Minn trigger, putting Fool's Demise from your hand onto the battlefield attached to Cromat.
6. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to Cromat's power.
7. Repeat.