xy steam siege booster box XY: The Mythical Steam Pokemon Volcanion must wield the dual powers of fire and water to stop them. Pokemon XY Steam Siege Booster

However, the introduction of Hilda in "White Flare" changed this

No official information has been released about which cards are the rarest, but it seems the holographic cards are a little bit harder to track down

Compiled from a total of 554 top-placing decks from 75 competitive tournaments held in Japan and China Mainland, here is the final metagame breakdown of the OCG 2016.07 format

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Team up with N's Zoroark ex, Iono's Bellibolt ex, Lillie's Clefairy ex, Hop's Zacian ex, and more Trainer's Pokmon, and discover the unstoppable power of friendship in the Pokmon TCG: Scarlet & VioletJourney Together expansion

Put the rest of those cards on the bottom of your library in a random order