User blog comment:Affectos/Artifacts of the Past! WH13 meets YuGiOh/@comment-4273152-20131228012133/@comment-893816-20131228085549

Really I'd see thing as being more of a recreation of Jam Breeding Machine:

Activate when "Warehouse Agent - Undead" is face-up on your side of the field. When a Monster is destroyed and sent to the Graveyard: Special Summon 1 "Thrall Token"  (Machine-Type/Earth/LEVEL 3/ATK 1000/DEF 500) in Attack Position. These Tokens cannot be used as a Tribute for a Tribute Summon. When "Warehouse Agent - Undead" is Removed from the field: Destroy this card.