I haven't tried to see how far up the league I could get yet but its not looking good thus far. I'm essentially in the same boat as you. Yesterday I started removing cards from one account to level up my main. I end up purchasing $20-$30 worth of cards also. Considering you kicked my ass in every tournament we both been apart of it looks grim for me reaching the top 50 without doing more combining.

Good luck to you !