pokemon first generation cards Base Set (1st Edition & Shadowless) are first generation pokemon cards

That means you'll be able to play one less land that turn, and you can't play it if you've already used up all of your land drops for the turn

However, it requires you to draw and play the card which in a singleton format, isnt always a guarantee

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In Mox Opal decks, Tamiyo is useful for the extra artifacts she provides with her clue generating ability, which can - for instance- turn Opal's mana generation online

Japanese cards, by contrast, are sold primarily in Japan and a few Asian markets

There are exceptions, of course