The XY set is the first set in the XY series… confusing right? It was released in February 2014 and contains a total of 146 cards. The set is made up of two subsets… X and Y. The X collection features Xerneas and the Y collection features Yveltal. The XY set is also the first to feature Mega Pokemon and Fairy types.
The valuable cards tend to be the 14 Pokemon EX (2 of which are Mega EX), along with some of the more powerful energy, trainer, and item cards.