King Lion is one of the three skins released in the Excalibur offer. It could be purchased for a limited time as part of an item deal in March 2017.
King Lion could be purchased for $4.99 in a deal that included 3250 coins. It could also be purchased for $19.99 in another deal that included the Magic Hat skin and 1800 DNA. It was not available for individual purchase and may not be available for purchase in the future.
Details of this skin may vary depending on location, platform or time.
Note: The Excalibur offer with the King Lion skin was released again for a limited time in early January 2019.