The art even touts some space for an Eevee appearance, which only increases the eye appeal, and thus, the price of this beautiful card
Theres the issue of getting it tapped first, but theres always just the simple solution of battling with it
List of All Shiny Cards in the Shining Revelry Set Pokemon TCG Pocket has expanded the roster of Shiny cards with each new expansion, and the game will likely continue adding more Pokemon in this category with every set
With a set reprint on the horizon, it's unclear how the cards value will be affected but being an Umbreon, it will surely hold a lot of value going forward regardless
It doesnt fall off on its own, but fake holograms could be scraped off with a tool, whereas holograms on real cards are flush with the rest of the cardboard
You don't need to have cast it originally