how rare is the ancient mew card

how rare is the ancient mew card Found an promo card, seen it go over 300$ on ebay. Can someone explain why it's so valuable? : r/PokemonCardValue Ancient Mew PSA 10 1999 Japanese Ancient

Name: how rare is the ancient mew card Found an promo card, seen it go over 300$ on ebay. Can someone explain why it's so valuable? : r/PokemonCardValue Ancient Mew PSA 10 1999 Japanese Ancient
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SKU: 32246611769
Price: 24.56 USD
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SKU: 32246611769

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Description

Foundations Play Booster Box Dive into Play Boosters are the best way to discover all that Magic has to offer

Card Types Leader: 6 types Common: 45 types Uncommon: 30 types Rare: 26 types Super Rare: 10 types Secret Rare: 2 types Special: 6 types Don

Preserving Physical Card Elements During Encasement Investing in a premium magnetic one-touch card case does much more than provide a clear window for display