This item is a Magic the Gathering playmat featuring the artwork of Chandra, Bold Pyromancer by artist Zack Stella originally featured in Dominaria and created for the Pax East Boston 2018.
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.