When Repository Skaab enters, its exploit ability triggers.
Holding priority, cast Not Dead After All by paying , targeting Repository Skaab.
Resolve the Repository Skaab trigger, causing it to exploit itself.
Pitiless Plunderer, Repository Skaab's second ability and Repository Skaab's ability gained from Not Dead After All trigger.
Resolve the Pitiless Plunderer trigger, creating a Treasure token.
Activate the Treasure by tapping and sacrificing it, adding .
Resolve the first Repository Skaab trigger, returning Not Dead After All from your graveyard to your hand.
Resolve the second Repository Skaab trigger, returning it from your graveyard to the battlefield with a Wicked Role token attached to it.
Repeat steps 2 through 4 one additional time.
Pitiless Plunderer, the Wicked Role token, Repository Skaab's second ability and Repository Skaab's ability gained from Not Dead After All trigger.
Resolve the Wicked Role trigger, causing each opponent to lose 1 life.
Repeat from step 6.
This clever loop turns Repository Skaab into an endlessly recurring engine by leveraging its own exploit ability to sacrifice itself. Pitiless Plunderer plays a vital role here, transforming each of those creature deaths into a steady stream of Treasure tokens to fund your spells. Meanwhile, Not Dead After All ensures the Skaab keeps bouncing right back to the battlefield—returning itself and the spell to your hand along the way—while the Wicked Role token it leaves behind drains your opponents' life away with every single iteration.