Impossible Grails #8 features the lowest population full art cards from the entire XY era as well as 2 additional ultra low population XY full arts.  The Sharpedo from Primal Clash is a population 9 which is a complete outlier of the XY era. This card is by far the lowest population full art from the XY era! A typical PSA 10 population for this era is around 500 to 700. Extremely low population cards like this are even bigger chase cards when they are so far below the average population. We have also included a pop 17 Kangaskhan from Flashfire and a pop 24 Thundurus. If any three of these cards were from the EX era or WOTC era, they would be several hundred thousand dollars each. I feel that XY is the most underrated Pokémon era and will continue to grow rapidly in popularity over the next few years. As these cards, age and get closer to the vintage threshold, these extremely low population, impossible grails will become more solidified chase cards. With populations and gem rates this low, building a complete set of PSA 10 cards is nearly impossible. The additional two cards included are both PSA 10 population ones!