From the Publisher:

If you're looking to explore this set and the world of Avatar: The Last Airbender, you've come to the right place. Jumpstart Boosters offer an easy way to start playing Magic. Simply open two Jumpstart Boosters and shuffle them together for a complete deck. It's a sleek and simple way to play Magic.

Magic: The Gathering | Avatar: The Last Airbender Jumpstart Booster boxes each contain 24 Jumpstart Boosters with at least 1 new-to-Magic card from TLE in each booster.