This app was mentioned in 7 comments, with an average of 0.86 upvotes
this game called soul guardians may be just the game you looking for it a rpg game were you collect cards yo boost your player tons of different classes, very free to play friendly. https://play.google.com/store/apps/details?id=com.zqgame.SG.en.androidgp&hl=en
There is one on (android) mobile I played for a little while maybe a year or two ago that has quite a few maple story-type elements. If you have an android check it out here:
https://play.google.com/store/apps/details?id=com.zqgame.SG.en.androidgp&hl=en
how about this mmorpg https://play.google.com/store/apps/details?id=com.zqgame.SG.en.androidgp&hl=en
https://play.google.com/store/apps/details?id=com.zqgame.SG.en.androidgp&hl=en f2p friendly lots of guilds and even a arena to fight other players
this game is just what you looking for https://play.google.com/store/apps/details?id=com.zqgame.SG.en.androidgp&hl=en