Not only does this change which cards and effects might be valuable to either side, but it allows for more specialized deckbuilding on the hero side as players might try to take up different roles to combat the multidimensional threat of the archenemy
Being one of the starter evolutions, this is likely a card that many players had on hand at one point or another and may not have realized the value it would one day hold
If you're interested in the full list of Secret Rares from Stellar Crown, you can check them out here
The way to do it right is to use the age-old game theory principle of extending the purpose
With the exhilarting power of Mega Venasaur-EX, Mega Charizard-EX, and Mega Blastoise-EX, plus some wild suprises like Dragonite-EX, Ninetales BREAK, Machamp BREAK, and Mega Slowbro-EX, the classic hardbattling Pokemon and old-school Trainers are reinvented for a new generation