There is a lot of free games just check steams free to play games and most mmo games are free then there is moba games or just like someone said there is always torrents but its still better
to play free to play games
Here is some of my suggestions
1 Smite
2 Dirty bomb
3 Dungeons and defenders 2
4 Warframe
5 Shadowverse
and ofcourse League of Legends