This app was mentioned in 2 comments, with an average of 1.50 upvotes
https://play.google.com/store/apps/details?id=com.threesixty.mmaf&hl=en
A mixture of card game with MMA. Good graphics, intuitive UI and smooth gameplay. One of the best freemium model i've ever seen. They gave you free VIP status after certain level. And its entirely possible to compete with the top fighters without paying anything. Requires energy to play career mode (PvE) and training mode. But energy regen is pretty fast compared to similar game. You can watch ads (optional) to double your fight money and to gain extra energy boosts.
Cons: Game can be a bit grindy and repetitive. There's difficulty of finding players in higher tiers league mode (PvP). Though sometimes its easier to find players to fight with in the career mode.
https://play.google.com/store/apps/details?id=com.threesixty.mmaf there is right link