Araneaphyx is one of the two skins released under the monthly Bounty Hunter offer. It could be individually purchased with game coins in mid October 2018.
Araneaphyx could be purchased in the Skins Shop under the 'Bounty Hunter' tab for 2900 coins. This skin was available for a limited time and may not be available for purchase in the future.
Details of this skin may vary depending on location, platform or time.
Note: The Bounty Hunter offer with the Araneaphyx skin was released again for limited times in mid September 2019 and then in mid March 2021. The price for Araneaphyx remained at 2900 coins for each release.