Critical thinking too, and vocabulary. Many times have I only had 1 card in my hand, and nothing else on my side of the field after knowing many endless combos with a deck I designed I ended up with many monsters, and a few cards in my hand. There's lots of keywords that this game uses as a game mechanics, and therefore apply different rulings. There's a difference in this game between sending cards from your hand, and discarding cards from your hand. If you know any kids, or teenagers who might be anti-social, or somewhat socially awkward this game might help them break out of their shell.