If you want to grab the collectors, you may as well start now-look for one in the 10-20k clintz range that isn't totally useless and belongs to one of the clans you like to use.
If you honestly don't care at all, 13k can get you one of the most powerful cards around; I'd recommend Jackie, Wee Lee or Marco, depending on which clan you like more. Or you might want to make sure it's a card allowed in ELO (like Charlie-for now), thus netting you a solid card to help you reach the points you need to be in the random drawings for rares and collectors.
R u looking to buy a new clan?
Or if you can spend it why not try your luck in the guild market. Invest your money on cards that are low on market right now
like Murray is way too low for his stats. and see if his price gos up in a week or two.
That kind of thing can turn your 13k into 20k easily
Hmm, try getting a Blaaster and finsih your Bangers set since they are currently the most powerful clan out there w/ great supporting cards like Graff and Vermyn N *3. After w/c you can start w/ a Striker w/ is a life blood of All Stars then finally a Shakra to compete w/ mirror decks, GG's!