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Factors determining value include the cards' rareness, the character (Mew, Mewtwo, Pikachu and Charizard tend to be more valuable) and the artist, who is indicated on the card.

Ungraded & graded values for all Pokemon TCG XY Pokemon Cards

It encapsulates basically every card on the service aside from those that are banned (which well list below)

11.10 The Company may claim a lien on any goods held by the Company for the Seller until all money payable to the Company by the Seller has been paid and, if it is not paid within 28 days, may exercise a power of sale over those goods

[3] These rarities have the highest potential to be valuable, so separate them from the rest of your collection