Consider, if you will: Toshi and Michiko were the two most important characters in the Kamigawa storyline
On cast youre granted another turn, which, when combined with its inability to be countered and protection from all colours was more than enough to get it banned in the Commander format
Dismiss had already demonstrated the joy of counters that didn't cost a card, but Mystic Snake had the ability to become more than that
Like most Pokmon cards, the value of Dark Machoke depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Team Rocket)
That means this card is also the newest release on this list, which is commendable
But I think Collector boosters are a huge money pit, and you are unlikely to get out of them what you spend on them