I played for years in middle school, and I never got rid of my cards. It’s actually pretty fun to go back and play now and again. Though it’s still been years. My main deck was a ridiculous 4-color deck that had a ton of variety and was based around massive Beserk attacks, with weird legends and all double-lands. Can’t say much about playing online, somehow that seems less appealing to me. I’d just check out the local comic/cards shop in your town. Apparently it’s still quite popular, and there’s all sort of fun tournaments (where you buy the cards there—so they’re very accessible). I’m sure it will all come back to you. Have fun!