While some of the high-value cards have sold for hundreds of thousands of dollars (like the First Edition Shadowless Holographic Charizard 1999 edition and the Charizard Topsun Blue Back 1997), one particular Pokemon card has proven to be the most valuable (and perhaps the best Pokemon card overall)
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Umbreon VMAX Alternate Art (Evolving Skies): A more modern card, nicknamed Moonbreon by collectors
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This means that it doesn't work for Eevee but will work for any Flareon, Vaporeon, Jolteon, Umbreon, Espeon, Leafeon, Glaceon, or Sylveon Pokmon card
Internally, their name is slightly different as well, with an "A-" prefix to indicate that they are the rebalanced version