Disa the Restless + Altar of Dementia + Golgari Thug + Leyline of Transformation

Disa the Restless

Altar of Dementia

Golgari Thug

Leyline of Transformation

How it works

1. Activate Altar of Dementia by sacrificing Golgari Thug.
2. When Golgari Thug 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 Golgari Thug's power, which will cause you to mill Golgari Thug.
4. As Golgari Thug is a Lhurgoyf due to Leyline of Transformation, Disa's first ability triggers, returning Golgari Thug from your graveyard to the battlefield.
5. Repeat.

This clever loop transforms your graveyard into a perpetual engine by rewriting creature types with Leyline of Transformation, ensuring that Golgari Thug counts as a Lhurgoyf wherever it goes. When you sacrifice the Thug to Altar of Dementia, its death trigger puts it back on top of your library, only to be immediately milled back into the graveyard by the Altar's resolution. Because it hits the graveyard from a zone other than the battlefield as a Lhurgoyf, Disa the Restless swoops in to automatically return it straight to the battlefield, setting you up to repeat the cycle infinitely.