Every printing and edition
It's nothing too major, but they do look cleaner and sleeker, and very much fit in with the sense that the set's release coincides with a "new" version of a classic
Making room for new cards
At the end of the turn, if Heatran is on your bench, you may take any two basic energies from your Fire or Metal typed Active Pokmon that you discarded that turn, and reattach two of them
Being able to get things out quicker means you can take advantage of the extra draw from Rammas Echor, or deploy The Great Henge earlier
With the inclusion of newer cards such as Forest of Vitality (MEG 117) and Meganium (MEG 10) , the deck becomes significantly faster to set up, allowing you to play aggressively and prevent your opponent from setting up