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- Over 110 cards
- 8 new dual-type Pokémon, many of them Shiny
- 6 new Pokémon-EX, including two Mega Evolution Pokémon
- 7 new Pokémon
Dual Powers Clash! Long years of stability come to an end when Shiny Mega Gardevoir-EX lays siege to the mighty Gear Palace with a host of greedy forces. The Mythical Steam Pokémon Volcanion must wield the dual powers of fire and water to stop them! As the battle rages, Xerneas and Yveltal face off in the Pokémon TCG: XY—Steam Siege expansion!