The elusive unicorn from medieval legend has been making a comeback. Once only found in enchanted forests, unicorns have been popping up in social media with shimmering unicorn-themed food and drinks. Now Starbucks is taking the trend to a new level with its first Unicorn Frappuccino blended beverage, available starting April 19 through April 23 while supplies last.

The Unicorn Frappuccino blended crème is made with a sweet dusting of pink powder, blended into a crème Frappuccino with mango syrup and layered with a pleasantly sour blue drizzle. It is finished with vanilla whipped cream and a sprinkle of sweet pink and sour blue powder topping.

Like its mythical namesake, the Unicorn Frappuccino blended crème comes with a bit of magic, starting as a purple beverage with swirls of blue and a first taste that is sweet and fruity. But give it a stir and its color changes to pink, and the flavor evolves to tangy and tart. The more swirl, the more the beverage’s color and flavors transform.

This limited-time offering is as fleeting as a rainbow, available April 19—23, while supplies last in participating Starbucks stores in the U.S., Canada, and Mexico.