Magic: The Gathering - Throne of Eldraine Theme Booster. Set comes out on 10/4/19.
MTG Themed boosters are aimed at players who either prioritise getting lots of cards or who prefer to have more control on the kind of cards they’re opening. Each Theme Booster comes with 35 cards and are each focused on a theme. Each MTG set can handle its Theme Boosters differently but Throne of Eldraine will offer colour themed booster in which all the cards in the booster can go into a monocolor deck of that color.