In this case, Charizard ex's ability can power up its own attack and leave one extra fire energy to go onto Dragapult
Japanese editions are especially popular for grading submissions and sealed collections thanks to consistent production quality
When Arita signs a modern SAR, expect heavy collector demand at release
In addition to this, a big part of the reason these cards were so popular was because the mana in that Standard format was quite bad, to the extent that you were pretty close to wanting Attune with Aether in your decks even before the energy bonus, but once you have the energy bonus you might as well play Harnessed Lightning, which means you may as well play Rogue Refiner to power up your kill spell, and so on
The game also includes many promo cards, such as "Stardust Dragon/Assault Mode", "Shield Wing", "Elemental Hero Absolute Zero" and "Genesic Dragon"