[quote=Cayden Black]
Never tried Leage of Legends but I heard you had to pay for it.
[/quote]

Nope, you can play it without ever spending a cent. It's rather more limiting than Dota 2 when it comes to free play, as rather than having every character available for play LoL has a rotating roster of 10 free to play characters each week, though you can earn in-game currency through playing matches and use it to permanently unlock any of the characters. Paying real money will only save you some time (by way of getting the champions instantly with cash instead of grinding game currency) or make you look pretty with skins, no need to ever pay to play if you don't want to.