It wasn't even shiny
LOB 1st ed (and other 1st ed early sets too, the iconic/chase holos can easily get into the mid 4 figures) SDK and SDY 1st ed holos DDS and FMR promos Bandai chase holos OCG series 1 ultras and secrets OCG series 2 and 3 Ultimate rates (SM-51 but also all the others too) DMG - various printings Ghost rares are modern cards that seem to do numbers I am sure I am missing some heaters from the middle eras like GX and 5Ds which had their fanbases
It may be the most broken, but it goes the least wrong, when it goes wrong, the majority of the time
All the mechanics got called out, but the three I heard the most about were Saga creatures, job select, and tiered
Pillar Analysis: Legendary Power (Artifact Mana), Scarcity (Antiquities, Reserved List), Format Defining (Vintage)
The abilities, the use of the 7 motif, even the text alignment