I can see the benefits of the system, provided the cleansers drop rate is not too low. Please be sure it is unbound.The intention is that acquiring the decks will be relatively quick, and starting to get the benefits of the system will also be relatively easy. Fully optimizing all of your gear sets is not intended to be easy nor shortcut significantly with something like the card of cleansing; rather, the card will give you an opportunity to get another chance for a particularly high-value item that you really want to replace the deck effect on.
It would be hysterical if it only drops in normal/hard difficulty quests and includes a label "Put this on the Auction House. Vets will pay dearly for it!"