maze of master booster box the Pack [1st Edition] or rev it up with Accel Synchro Stardust Dragon Yu-Gi-Oh! Maze of the Master

During your Main Phase, if you control a "Primite" monster: You can Set this card from your GY

Luxiors not necessarily the best equipment, but it makes the list for the sake of the weird interactions it creates

You can lay it horizontally and just flip it halfway through to let gravity do its magic

Because sourcing happens at street-market level rather than through an international trade tier, volume discounts exist but are incremental, not transformational

Each card was a legendary creature on the front face that would exile themself and return to the battlefield transformed as a planeswalker if a certain condition was met