Proposition Joe said:
Back in the golden age you had 0% interest and could balance transfer into it with no fees and just have free money for years.
I don't think those exist anymore though -- every 0% interest on balance transfers I see now comes with a % fee to transfer the balance, so it's only really useful for getting out of high interest cards (but paying a price to do so).
They still exist. Discover it, Chase slate, Amex everyday, and Bank of America back card.
There is still probably a few others out there, but on a seasonal or offer basis.