Ah let me see if I can still add a fullscreen option..
You die if you discard all of your cards actually haha..
Discarding is essential because you can only see four random cards from your deck at once and if you'd like to select another random card you need to get rid of one. Once you run out of cards you die.. so it's a bit of a balancing act. (It becomes more important once you learn spells and have a bunch of cards, you might need to discard a few to get the one you want)
At least that was the intention.. :') Thanks for the feedback!