Here ya go fellas, something to start with finding the raritity of a card then check your favorite app for the exact value. If you can't tell if the card is authentic How to Check Pokemon Card Value and Appraise Your Collection IGN Ungraded Holo Mewtwo Mewtwo Holographic Pokmon Card Base Set #10 102 Lightly Played (LP) Condition Ungraded, Excellent For Collectors Or Players Ungraded Lightly Played Mewtwo Holo Mew Two Pokmon Card: Is This Shiny Holographic Gem Worth Your Collectible Budget? How to Tell If Pokemon Cards are Real or Fake Cherry Collectables