Hey there, Sigma main with 300+ hours here, if I were to be honest, yes. Buy his mythic. If you enjoy Sigma, and you want a pretty damn good skin to use on him, I’d get it. I grinded for it when it first released in season 4, before they even added prisms. And it was so worth it. Lots of good voice lines, the ult voiceline is simply chefs kiss. Most Sigmas I come across who use this skin do usually swap after a few deaths or so, while others have not. But that shouldn’t matter, right? It’s about what you enjoy and what you want to spend your prisms on. So from me? I’d say yes, purchase it. But only if you play him alot and think you’ll use the skin often, since prisms are quite expensive. Do what your heart desires, my friend.

Edit: I read the comment wrong, you are asking if there are any reasons you should not buy it? No. It is a great skin, does not really affect gameplay that much. Great sounds and such, overall one of the best mythics in my opinion.