You're fairly close in your latter guess, actually. And in your assessment of the person choosing to use it being "hugely reckless". As it turns out, the price for having one's heart's desire granted is the life of the person making the wish.
That's quite the trade, isn't it? To be granted the thing you want most, but with the guarantee that you won't live to see it come to fruition.
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That's quite the trade, isn't it? To be granted the thing you want most, but with the guarantee that you won't live to see it come to fruition.