The lesser\\phantom combo was one (I think THE) first captive bred leucistic.

What where the parents of your blue eyed leucistic? If she is a homozygous mojave or at least has one mojave allele then you have a shot at mystic potion. At least assuming your buddy’s male is mystic. Not sure if the phantom\\mojave cross has been done yet to further prove that phantom makes as nice a cross as mystic but so far the consensus is that phantom and mystic are the same.

If your blue eyed leucistic is a combination of lesser, butter, mocha, or Vin Russo without a mojave allele then you might only be able to produce white snakes like the lesser\\phantom combo (aka Karma) in addition to lesser, butter, mocha, or Vin Russo.

Not sure if the combo of mystic or phantom with fire or sulfur has been done yet. I know the sulfur mojave combo was not white but I thought it made a very nice bright mojave, particularly faded as an adult.