Golgari Thug + Altar of Dementia + Dross Harvester + Gwenom, Remorseless

Golgari Thug

Altar of Dementia

Dross Harvester

Gwenom, Remorseless

How it works

1. Activate Altar of Dementia by sacrificing Golgari Thug.
2. When Golgari Thug dies, it and Dross Harvester trigger.
3. Resolve the Golgari Thug trigger, putting it from your graveyard onto the top of your library.
4. Resolve the Dross Harvester trigger, causing you to gain 2 life.
5. Resolve the Altar of Dementia ability.
6. Cast Golgari Thug from the top of your library by paying 2 life.
7. Repeat.

This looping engine leverages Altar of Dementia as a free sacrifice outlet to mill your library while repeatedly sending Golgari Thug to the graveyard. Each time the Thug hits the graveyard, its dredge and rescue triggers allow you to manipulate your library, while Dross Harvester steps in with its passive lifegain ability to cushion the life total. That buffer is essential because Gwenom, Remorseless enables you to cast Golgari Thug directly from the top of your library by paying life equal to its mana value rather than its mana cost, creating a seamless self-sustaining loop.