No guarantees whatsoever, but I was interested enough to try once and had some success. They weren't near as bad as those, though. Took the deck and flipped every other card. Set that on a flat hard book. Then, further flat hard books on top. Built a tower about 3 ft tall of massive books. Left for days. I was partly joking, but it actually did seem to help some.
Put your deck between two flat and heavy surfaces and leave it there for a week or two. Meanwhile, purchase another setup to play with. By the time you remember to check after having forgotten that you did the experiment in the first place, they should be flat.