Similarly to Charizard, a Mewtwo card with the right art can instantly become a collectors item and highly desired due to the Pokemon being iconic
This guide dives deep into the different types of cards like EX, VMAX, V, GX, and rarities such as Secret Rare (SR), Art Rare (AR), and Secret Art Rare (SAR)
The deck is filled with Zombies that are either providing a bunch of sacrifice fodder like Diregraf Colossus, sacrifice outlets like Corpse Harvester, sacrifice payoffs like Midnight Reaper, and other powerful Zombie payoffs like Noxious Ghoul
A pack could cost a million dollars and have a positive expected value if it contained enough valuable cards, and a pack can (and has) cost $4 and have a horrible expected value, causing you to lose a bunch of money (on average) with every pack you open
You might also lose some money as youre starting out nobody is going to have perfect foresight regarding every product, especially as theyre building up their knowledge and expertise