Are the actors colliding? Check the collision groups and make sure the button is green for them. Also, if you did the coding as a behavior, be sure to attach it to the actor.
Some ideas: More cards. Booster packs, possibly, and maybe you win a card each time you win a battle. Multiplayer, of course. But most of all, loose the stupid luck thing.
In the scene part of the dashboard, you should see a star on one of your levels; that's your starting level. Make sure that is changed.