Welcome to Hifiguides,
So, a big mistake I see people trying to make in this area, especially for gamers, is that they think that by going to one of the most expensive models will make them feel as though they don’t need to upgrade or this is the “best” they can get. Price will not govern how much you appreciate that headphone and in this hobby you tend to be tempted to try different headphones. However, lets go ahead and answer our question of are the arya’s good for gaming? Yes, they are a neutral bright headphone with a very wide sound and a hell of a lot of detail however you can gain good sound in that sound signature from anandas, sundaras, dt 880s, among a vast majority of other cheaper ended headphones. M50x isn’t particular a good standard for headphones just in general I fully believe the m40x blows them out of the water once you swithc their pads. I will highly recommend you take it down just a notch and look towards budget friendlier options as you can place that lump some towards a really amazing setup such as speakers for your pc, new pc parts, games, etc.
Yes, though I would switch out the 887 with schiit jot, but again I would highly advise against going full tilt. Audiophile as a hobby is a bit of a journey jumping to the very end you will never know if perhaps you could’ve taken a different route that proved not only better but more budget friendly.
As someone new to headphones this is even more reason to perhaps take a step back. If you are looking for headphones more tuned to competitive games please check out my write up over here (update in progress) Falenkor's Competitive Headphone Write Up. Now with added Hardware explanations! - #39 by Falenkor this will explain the sound you would be most ideally looking for in competitives and why alongside multiple guides amp/dac recomendations that are budget friendly mouse explainations monitor explainations etc