I want to make a cocktail with champagne, lemon juice, another liquor, and frozen mango juice cubes.

It sounds like you're looking for a refreshing, fruity cocktail that includes champagne, lemon juice, another liquor, and a touch of mango. Based on your preferences, one of the best matches might be the Champagne Pomegranate Fizz. This cocktail already includes champagne and lemon juice, and also features gin, which provides a botanical undertone that pairs beautifully with fruity flavors. Adding frozen mango juice cubes to this cocktail would not only enhance its tropical flair but also provide a delightful, cooling effect as they slowly melt into the drink.

The subtle tartness of pomegranate juice combined with the floral notes of elderflower syrup creates a sophisticated and well-rounded flavor profile. The inclusion of frozen mango juice cubes would introduce an additional layer of sweetness and a vibrant tropical twist, complementing the champagne's effervescence. This combination makes the Champagne Pomegranate Fizz not just an elegantly balanced cocktail, but also visually appealing with a colorful, festive look—perfect for any celebration.

To customize it to your tastes, simply prepare the cocktail as usual and then drop in the frozen mango juice cubes for a refreshing, exotic touch.