54x86 card sleeves "North Sea / Garphill Games" (54x86mm) -110 Pack, 60 Microns SKS-8821 clarity inner sleeves deliver archival Giochix: Bustine/Sleeves Giochix standard 54x86mm

Those get reported and taken down eventually because it's easy to tell, but for rarer cards, how do you 'prove'

Prices are updated based upon YuGiOh 2019 Gold Sarcophagus Tin Mega Pack listings that sold on eBay and other marketplaces

The 30th Celebration appears to be a larger-scale, more premium version of that concept

The reason why we go with Esior over the more poular Siani, Eye of the Storm is that Esior is a guaranteed turn 2 play that we can cast before casting Eligeth, providing an extra layer of protection for our most important card

Legendary Dragon Decks Announement | The Organization"

You can read the whole story here, back from when Wizards initially banned the equipment in Standard, but the short version is that Skullclamp was changed from giving the equipped creature +1/+2 to +1/-1 late in development and slipped through the cracks