20 Diamond Blocks. And for good measure, 1 stack of lapis blocks
Not really. If you think about it, I used to have over 4 or 5 stacks of diamond blocks. I could easily go back and get some more if I dedicated myself to mining again. However, there is only 1 sword that has these specs on it in the whole game. Its like on that episode of South Park- The Sword of Truth. There's only 1, and you can't get it unless the minecraft gods bestow it upon you (or through voting). There used to be a 2nd one, but that person lost theirs. If Xec is consistent with his voting, it will take him at least 15 days to reach his. If I'm consistent, it'll take me another 3 weeks. The next active person on that list, I believe, is Lacar, and he is several more weeks behind me. Even if the next 5 people all got the sword, I would still be buying it for enormous sums of money, primarily for the rarity factor. But then again, you're talking to a guy that spent 2 stacks of diamonds just to buy 1 Ozy-block. Spending promotes the economy (until you go broke.
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