I used to play a ton of MTG (Magic The Gathering) in high school. Of course back then, almost nothing was online or digital. It was good'ol physical collectible trading cards. If you havent played MTG before, think of it as kind of like Spades & Chess mixed and on steroids.
It's really easy to learn to play, less than 10 minutes I'd say. So If your looking for a fun card game to play, look no further.
Don't worry you wont need to purchase anything to play, you'll get more than enough cards to start playing.
Seriously... 5 Pre-Built decks, which you can customize when your feeling more comfortable with the game. And you get plenty of free cards, and booster packs the more you play.
Have fun!