If you are looking for a really fun MOBA that shows lots of signs of offering even more, then The Witcher Battle Arena is the game for you. Yes, the game does have in-app purchases, but it never once made me feel forced to get them to be competitive, in fact, the game never really even promoted their in-app stuff like most of these free game do. The Witcher Battle Arena is available now on Android and iOS devices and comes highly recommended.