I have done it many times when league lapsing occurred, it's not as hard as people make it out to be. It's very simple, if you have a higher level deck you will blow through the bots in lower leagues. The game is going to be hard if you don't put anything in. If you don't rent cards, or buy cards, you won't get very far with a very basic lvl 1 bcx deck. That said we should absolutely have more play modes beyond ranked play anyway.