I'm going to talk as phantom and mystic are not the same morph, even though i believe they are
phantom, mystic, and mojave all sit on the same locus. the phantom/mystic will either give a mystic or phantom gene. not both, not none. so every offspring will have phantom or mystic, then breeding it to a mojave, each offspring has a 50% chance of getting the mojave gene, to make potions or passions.
in other words it is impossible to get phantom, mystic, and mojave all in one snake.