A reasonable approximation of the expected power of gold cards is that your 2nd colour of mana adds about a 1/3rd of a mana, the 3rd colour adds 2/3rds of a mana and the fourth is a whole extra mana
If the result is a face-down card, it's a colorless 2/2 creature, the same as one would get from using the morph ability
So Modern prices will start to drop
The two main Pokmon in the deck, Garchomp and Altaria, both have HPs that are perfect for keeping an Accelgor lock in place
The most well-known of these reasons is to commemorate the release of a new Pokmon video game, which usually arrives shortly before the set in question
It's an elusive set that is already earning the right to be compared with the often-scalped 151 set, but if you're desperate, the Japanese version is still easy to get your hands on