unless you happen to randomly hit a 90%+ high white pied, mystic potion pied should not be an all-white snake, super mystic is quite white with residual pattern and super mojave is very white with only a light-grey head and some patternless grey, but the mystic potion definitively has enough color to work very well as a pied.
i wonder what happens to the backstripe of the mystic potion if you combine it with pied.