Board Thread:Game Discussion/@comment-174.16.221.237-20130726183802/@comment-10708945-20130727012928

Yes higher bosses are related to your deck power (and with that you climbing higher in the ranks) once you have one cubed a boss a bunch of times the game will start sending you higher level bosses. If you can't take out a Growl 3 the game won't feed you a Dropshot 7 next scan . That's way out of your range.