Then you find out the genie uses a signed data value and you now owe him a wish. You're not granted magic. You're compelled to grant the wish. The only restrictions on the genie's wish is that it must be within your (soft, squishy) mortal power.

I can imagine you being reset to the point of the genie's wish every time you die (naturally or otherwise) without succeeding. This could well turn into a Groundhog Day type situation.