Shiny Pokmon had been in many sets before and even had their own subset in sets like Call of Legends , but Hidden Fates introduced the term Shiny Vault, which took the form of a large subset that eclipsed the standard set in its numbers
Look at that stretched-out smile and lifeless eyes, pink and shiny like some form of crazy putty
If you control a Level 5 or higher "Harpie" monster: You can Special Summon this card from your hand
Be wary of buying from places like eBay while policies about card sales have changed for the better, its still not generally the best way to get Pokemon TCG cards
These were not a normal set of Pokmon cards, distributed through vending machines in Japan, and were unique due to being glossy rather than the standard card material
It is like quadrupling your mana production compared to your opponents