Hold on to something. One deck, one card, something. Someday you (or your kids, or nephew) will want to play, and you'll wish you had something from your past. I sold it all 15 years ago (for pennies on the dollar), and wish I had at least one sol ring or hypnotic specter from my original collection.
I couldn't agree more. Keep a deck or a couple of them, something sentimental, but keep something. I wish I had kept the 20k or so Plague Rats that I had, but the boxes were really a pain in the ass to deal with (at least some of my 675 duals would have been nice to hang on to as well, lol).