Finally did it!
Replaced my desktop pc (which I use for gaming) which had Windows 7 with Arch Linux! It was not hard because I already use it on my laptop.

OK it was a bit struggle with nvidia and cinnamon due to missing libraries I had to install which I don't know before.

But it is possible to play games on Arch?
Yes definitely!
CS:GO - works (native, steam)
League of Legends - works (wine)
World of Tanks - works (wine)

All I need is working (: