Yes, it pays to mine the Cool Chest

Yes, when you have a bunch of coins leftover from winning the Black Card Tournament, it does help to mind the Cool Chest for cards. Why? Because, if you're like me, you can't mine Quests for cards because it will increase the level of your hero. And you can't increase the level of your hero because you need to keep it at 3 or lower so that it costs only 1 Heart to play Deck Wars matches.

So, here are two examples of decent cards you can get in the Cool Chest. The Pickler is very useful, late in the game, against low-level decks, as most cards have 5 Defense or less. Corn Parthenon is not as useful, unless you happen to have a three- or four-colour deck.

But most of the time, you just get 1 Rarity cards, often worthless cards, like The Pig or Mouthball. You just have to be patient.