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It's due to their limited availability and unique design

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Its Rare rarity drives most of the premium over the set's regular cards

This is no coincidence, and even though Ive seen a few decks that power themselves with this card (Birthing Pod being the main deck), I still havent seen that much use for it (outside of Pod), and 40+ is waaaay overpriced for an enhanced version of a Birds of Paradise

Crown Zenith's relatively limited print run compared to mainline sets has kept supply constrained across the board, and the Galarian Gallery cards in particular have proven to have real staying power in the secondary market as collectors increasingly recognize the subset as one of the high points of modern Pokemon card design