Recs.
Updated
Marvel Puzzle Quest is a Marvel superhero themed free-to-play Puzzle Quest game where players match gems on a match-3 board in order to use powerful maneuvers against their opponents. The game is free-to-play and offers in-app-purchases that range from $1.99 - $99.99 per item.
SpecsUpdate
Pros
Pro Many options of Marvel characters to use
Unlike the Disney owned Marvel movie universe, which does not contain X-Men (due to their movie rights being owned by the Fox studio) Marvel Puzzle Heroes does contain X-Men characters which greatly expands the lineup along with Guardians of the Galaxy, SHIELD and Avengers characters.
Cons
Con Heavily weighted for players that pay money
Sadly the game can be unbalanced due to those that pay real world money getting a great advantage of powerful characters to use. The amount of time it would take a non paying player to earn the necessary characters to be able to compete globally would take so long that it is basically impossible.