Mystic & Spice sounds like a holiday.
It tastes more structured than the name suggests.
Spiced rum brings vanilla, cinnamon, nutmeg and often orange peel. Mystic Mango counters with fruit and sweetness. The key element is lime. It holds everything together. Without acidity, the drink turns soft. With it, the profile becomes precise.
The drink works because it delivers contrast. Warm versus fresh. Sweet versus dry. Exotic versus clean build.