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Not a bad idea, but there are enchants such as Burst. There are also good pickaxes on sale in the Auction House, and so it is not a enchantment...
I thought that there was already one for that, but I may be wrong
@GinioJWZ is right, if you have a good pickaxe, then you can mine fast enough, and just be careful when placing Obsidian
Liking the idea, maybe it could be able to break a 3x3 square instead of being able to break obsidian faster.