Mega Audino-EX was the star of the 2016 Pokemon TCG World Championships. The card was the highlight of the deck used by Shintaro Ito, the 2016 Pokemon TCG Masters Division World Champion. Following his win, the card’s price increased to upward of $20 on sites such as eBay. Ito’s winning deck also included Audino-EX, Shaymin-EX, Hoopa-EX, Magearna-EX, Cobalion and Absol.
Mega Audino-EX price increases following Pokemon TCG World Championships win
Pokémon Blog 