You can switch them out each time you collect to keep your customers engaged
A couple of friends are working on creating another Cube for the Spokane / Coeur D'Alene area, and so far they've taken almost two months, and are still nowhere close to being done yet
Just like the previous method, if that SR or UR card is found in a secret pack, the pack will be available to purchase
Later on in the game where a cheap small dork is weak and where an inability to block is far more relevant you at least have the option to make as a 1/1 which may sound awful but is correct surprisingly often and makes the card far far better than a straight 2/2 can't block would be
Most sets give us one first-of-its-kind design or another
You can even sacrifice Tom, Bert, and WilliamTom, Bert, and William since it will return to the battlefield as an artifact