Activate Lord of the Forsaken's first ability by paying and sacrificing Oathsworn Vampire.
When Oathsworn Vampire dies, Pitiless Plunderer and Zulaport Cutthroat trigger twice.
Resolve both Pitiless Plunderer triggers, creating two Treasure artifact tokens.
Resolve both Zulaport Cutthroat triggers, causing each opponent to lose 2 life and you to gain 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.
Repeat.
This loop is a masterclass in recycling life and death, turning a single sacrifice into an unstoppable engine of destruction. It all begins when you feed Oathsworn Vampire to Lord of the Forsaken, which triggers the life-gain condition that allows the Vampire to be cast straight from your graveyard. As the creature dies, Pitiless Plunderer funds future attempts by generating Treasure tokens, while Zulaport Cutthroat drains your opponents while padding your life total. Meanwhile, Teysa Karlov doubles every single death trigger in the chain, turning the output from these losses into an overwhelming flood of mana, life, and card mill.