Unknown Totem is one of the three skins released in the second part of the Ark Raider's Mystical Shop offer. It could be purchased as part of an item deal in mid September 2018.
Unknown Totem could be purchased for $14.99 in the limited time "Best Deal!" which included 25000 coins, 1200 DNA and the Evil Genie skin. This skin 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 second part of the Ark Raider's Mystical Shop offer was released again for a limited time in early April 2020. The price and included items for Unknown Totem remained the same.