That is only listed for withdraw, not deposit.
Oh well, I guess its for the best that people aren't allowed to rack up a huge credit card debt to trade forex. It took me quite a while to reach a point where I wasn't losing it all. Fortunately, my credit card limits were quite low while I was going through that losing phase.

Now you'll have to wait for some good balance transfer offers. Write yourself a nice balance transfer cheque, deposit it into your bank account, and wire it to Oanda!