Mutant Herb is one of the two skins released under the monthly Bounty Hunter offer. It could be individually purchased with game coins in mid August 2018.
Mutant Herb could be purchased in the Skins Shop under the ‘Bounty Hunter’ tab for 4900 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.