This is from the Chinese Project K trial decks before the game was officially released. Project K was the original "code name" for Riftbound, so this is the original first prototype of the Riftbound cards with the white borders before we got the newer official cards and borders.
If you have any questions or need any more photos/information please reach out!
Card has a minor print line under the cost and might on the front. Also very slight edge wear noticeable on the front.