If you choose to craft as an action, you trade in your resource cards to acquire a Craft Card.
They are, in order of most rare to most common: Craft
Some are plentiful, and some are more rare and therefore more valuable. For the TNT or Creeper cards, you take different steps (more on that later). If you choose to mine a Resource Card as an action, take 1 resource card from the top of one of the five Resource Card Piles and place it in front of you.