If you are looking for free game to test/play I recommend you Bloodline Champions. It's fast paced competitive arena game made by Stunlock Studios.

If you want to compare that game to something you it would be WoW Arena. But in this game you use your mouse to aim your skills and you don't need to level your specific "hero" any way. Instead of that you level your account and get access to different things like medallions which are like trinkets in WoW.

If you are interested you can always read more about this game from their websites.

I play that game as "Therier" if you want to PM to me in-game.