Everybody loves memorising playing cards! When the World Memory Championship was first invented, it was done with the knowledge that the two memory-themed world records anyone had heard of were memorising pi to thousands of places, and memorising a shuffled pack of cards amazingly quickly. And in those days, 'amazingly quickly' meant three minutes!
Memory competitions traditionally finish with the speed cards and have a 'marathon' cards discipline somewhere in the middle, although in National Standard competitions, the marathon is only ten minutes long. Ten packs in ten minutes has never been done, but I'm sure it's possible. I used to practice with nine, and it was a challenge, but if I'd spent the last six years doing more training, I might well be up to ten by now. I wonder who'll break that barrier first?
If there's one thing I'm particularly proud of in my memory-contest accomplishments, such as they are, it's the 'Ben System' for cards. The idea of turning two cards into one simple image was unthinkable until I did it, and now it's quite commonplace. But who'll be the first to do three?