Gear up for new ways to battle! Take control of Shiny Mega
Gardevoir-EX to lay siege upon your
enemies. Wield the dual powers of fire and water with the Mythical Steam
Pokémon Volcanion. Use dual-type Pokémon to open the way to new, powerful
strategies, and battle with the incredible Xerneas BREAK and Yveltal BREAK...all
in the Pokémon TCG: XY—Steam Siege
expansion!
The Pokémon TCG: XY—Steam Siege expansion includes:

Over 110 cards
8 new dual-type Pokémon
6 new Pokémon-EX, including two Mega Evolution Pokémon
7 new Pokémon BREAK