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It is actually a good tutorial which (A) explains the major concepts of the card game and (B) shows how the game works on Game Boy Color
To see an up to date list of some of the most valuable cards check out TCG Player's list of the best selling cards of the week
On a negative note, Skarmory is indeed a Mega Evolution, which comes with the clear risk of giving a lot of advantage to your opponent if it falls in battle, so that is the entire reason why I didnt dare include it higher on the list
Blood tokens are most similar to Clues
We view this as an authoritative grail asset that remains the ultimate test of condition-based rarity for any serious Charizard investor