When Eternal Scourge dies, Kinzu of the Bleak Coven and Blood Artist trigger.
Resolve the Blood Artist trigger, causing an opponent to lose 1 life and you to gain one life.
Resolve the Kinzu of the Bleak Coven trigger, causing you to pay two life and exile Eternal Scourge from your graveyard to create a token copy of it that is 1/1.
Activate Ashnod's Altar by sacrificing the Eternal Scourge token, adding ({C} magic symbol) ({C} magic symbol) .
When the Eternal Scourge token dies, Blood Artist triggers, causing an opponent to lose 1 life and you to gain one life.
Cast Eternal Scourge from exile by paying ({3} magic symbol) .