Make a game where you start with 100 coins and you can get a common card pack with weak mythological pop culture and cartoon characters for 5 coins for 10 coins you can get normal card pack with a randomly streathed pop culture or mythological creatures or cartoon then rare card pack for 100 with strong characters you can fuse any two card together and get a fusion there is a campaign mode with 1000 levels that get harder and harder there is 10000000 different cards