We consider this a premier collectors asset due to its bold, non-traditional artwork and its status as a definitive example of the technical rarity found in the late Sun and Moon era
Usually, if a monster equipped with an Equip Spell Card is destroyed, returned to your hand, shuffled into your Deck, sent to the Graveyard, turned into an Equip Spell Card (by "Relinquished"), flipped face-down, or anything else so that it is no longer a face-up Monster Card on the field, all Equip Spell Cards equipped to it are destroyed
40% thicker than most premium card sleeves on the market for maximum protection and card hand feel
Further, this impacts card evaluation
The Umbreon Master ball holo is perhaps the only other way for players to get their hands on a useful Umbreon Pokmon card from Prismatic Evolutions