There are competing theories about how often you should be able to win a cooperative game. Once every two plays? One in three? One in five, but you can improve that by building a solid deck? Nearly every time, but with graded scores? One in a hundred, because your game is Ghost Stories?
The Shipwreck Arcana — which trucks a little bit in the arcane but not even a titch in shipwrecks — hews closer to one in one. So close that even with the occasional loss, you’re hardly even rounding up.