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Each card carries the Traditional Chinese 5th Anniversary logo

For example, while it's in your graveyard, Twinmaw Stormbrood is a white creature card whose mana value is 6

On the other hand, being legendary also makes a creature card eligible to be chosen as a commander, and there are also many cards which specifically benefit legendary creatures

Top Colorless Ramp Spell in Commander has to be Mana Crypt, though

The ETB clears small boards, and the enchantment ability rewards every trade, sacrifice, or wipe that follows

The only packs I know of that do sometimes contain 1999-2000 holos are the Made in UK packs intended for sale in Poland (and have a large white sticker on the back of each pack)