Extradimensional Crisis wont make huge shifts to the meta like Celestial Guardians did, but it does elevate some decks into a more comfortable spot, maybe even pushing them into meta relevant status, all while offering plenty of support for existing decks
You do not need both
Its back is a Magic: the Gathering card, the border is gold rather than yellow, and the front of the card is foiled, a new technique for Wizards of the Coast at the time
Pokmon TCG: Scarlet and Violet: Temporal Forces: Booster Bundle Pokmon TCG: Scarlet & Violet Obsidian Flames Elite Trainer Box Big boxes are also on sale, and there is a good chance to fill binders with black star promos, card sleeves, badges, jumbo cards, and more
The implication is that Mewtwo's raw abilities were powerful enough that even its creators felt the need to dampen them before they could be used safely