The 2021 Panini Mosaic Prizm Green #173 Nicholas Castellanos Cincinnati Reds trading card is a standard-sized card made of card stock, featuring the Major League Baseball player Nicholas Castellanos from the Cincinnati Reds. This sports trading card, part of the 2021 Panini Mosaic set, belongs to the Mosaic Prizm parallel variety, designed by Panini in the United States. A sought-after collectible for baseball fans and card enthusiasts, this card showcases the player in a vibrant green prizm design, adding to its appeal and value for collectors.