Delta Species, released in October 2005 as part of the EX series, introduced the innovative Delta mechanic that allowed Pokémon to change their types, creating unique strategic deck-building opportunities. This 114-card set is highly sought after by collectors due to its scarcity, iconic Pokémon Star holos, and the ex mechanic cards that defined the mid-2000s competitive metagame. The set's age, limited print run, and nostalgic appeal have made it a cornerstone of vintage EX-era collecting.
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