This item is a Magic the Gathering playmat featuring the artwork of Elspeth, Sun's Nemesis by artist Chuck Lukacs originally featured in Theros Beyond Death with collection number 255 and created for the Pax South San Antonio 2020.
The playmat is embroidered, i.e. it has been stitched with thread on the borders to improve durability and to make it even more visually stunning, and wasn't sold outside of the event and is thus very rare.
The playmat size is around 35cm x 60cm.