I do like the effect too, where the Primordial Ooze mindlessly attacks, mindlessly grows, and you have to keep pumping mana into it (more mana as it grows, too!) otherwise it'll turn around and attack you
Trying to fit all ten shocklands into the deck makes it difficult to keep the mana proportional to its needs, as not every color is equally represented
Whether or not this justifies the $500 asking price of these boxes is another question entirely
Devilish Valet Invite all your creatures to the party
If you want to expand your search to the Japanese market, using a purchase support service like Neokyo makes it easy to cross-compare Japanese shops and flea market listings
There are Pokmon shops, food, events, and even trains, but where do you start