Activate Lord of the Forsaken's first ability by paying and sacrificing Oathsworn Vampire.
When Oathsworn Vampire dies, Pitiless Plunderer and Elas il-Kor's second ability trigger twice.
Resolve both Pitiless Plunderer triggers, creating two Treasure artifact tokens.
Resolve both Elas il-Kor triggers, causing each opponent to lose 2 life.
Resolve the Lord of the Forsaken ability from step 1, causing target player to mill three cards.
Activate Lord of the Forsaken's second ability by paying 1 life, adding C that can only be spent to cast a spell from your graveyard.
Activate both Treasures by tapping and sacrificing them, adding .
Cast Oathsworn Vampire from your graveyard by paying 1.
When Oathsworn Vampire enters the battlefield, Elas il-Kor's first ability triggers, causing you to gain 1 life.
Repeat.
This sinister loop transforms the recursive resilience of Oathsworn Vampire into a perpetual engine of life and ruin. By sacrificing the Vampire to Lord of the Forsaken, you feed Pitiless Plunderer and Elas il-Kor, Sadistic Pilgrim, whose death triggers are doubled thanks to Drivnod, Carnage Dominus turning every demise into a double-dip of Treasures and opponent life loss. Lord of the Forsaken then converts life into the exact color-restricted mana needed alongside your newly minted Treasures to recast the Vampire right back from the graveyard. Whenever Oathsworn Vampire enters anew, Elas il-Kor, Sadistic Pilgrim rewards you with the life gain required to unlock casting it from the graveyard in the first place, keeping the cycle spinning endlessly.