There's some definite potential here, but the game as it stands suffers badly from doing nothing to telegraph unlockable or undiscovered content.

When will something new show up in the marketplace? Who knows! How many card types haven't been found, and how rare are they? Who knows! How will you ever draw that many cards, since the growth rate of the basic options are clearly insufficient? Who knows!

At any given point in the game, it's effectively impossible to tell if the next bit of new content is one draw away or thousands. After a while, I hit a point where progress seemed to be slow and nothing new was showing up, so I quit.