The Current Environment consists of "core set, any other evergreen (perpetually in print) expansions, as well as the newer expansions that have not yet been retired." The Legacy Environment consists of "any product that has ever been printed for the game." Thus, newer products will exist in both environments while retired products will only exist in the Legacy environment
I cant possibly list here all the strategies because I am pretty sure there are 50+ viable decks that you can pilot to a tournament win, so I am including here the ones you are most likely to fight against, either because they are very strong or popular among new players
If you pair Emerald with Steel, you can even gain access to the infamous Grab Your Sword and A Whole New World
This product does not contain a serialized card (available in English-language Collector Boosters only)
Heres a guide to trading Pokmon cards like a pro, with insights every Pokmon enthusiast and trading card store visitor should know
Its power comes from Jace, Telepath Unbounds minus ability, effectively giving an instant or sorcery flashback until end of turn