When Repository Skaab enters, its exploit ability triggers.
Holding priority, cast Fake Your Own Death by paying 1, 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 Fake Your Own Death trigger.
Resolve the Pitiless Plunderer trigger, creating a Treasure token.
Resolve the first Repository Skaab trigger, returning Fake Your Own Death from your graveyard to your hand.
Resolve the second Repository Skaab trigger, returning it from your graveyard to the battlefield and creating a Treasure token.
When Repository Skaab enters, its exploit ability triggers.
Holding priority, activate two Treasures by tapping and sacrificing them, adding 1.
Repeat from step 3.
This clever loop transforms Repository Skaab into an entirely self-sustaining engine by utilizing its own exploit ability to sacrifice itself. Pitiless Plunderer quietly watches the proceedings, turning every single one of those self-sacrifices into a steady stream of Treasure tokens. Meanwhile, Fake Your Own Death ensures the Zombie Wizard immediately bounces right back to the battlefield while simultaneously returning itself back to your hand from the graveyard, ready to be recast and repeat the cycle indefinitely.