The Auston Matthews 2023-24 UD Credentials WHO'S BEST INSERT is a standard-sized sports trading card featuring the Toronto Maple Leafs player in the National Hockey League. Manufactured by Upper Deck in 2024, this original card is made of card stock with a thickness of 20 Pt. The card includes features such as being an insert and comes with an authentication from Leaf, making it a sought-after collectible for fans and hockey enthusiasts.