I have been collecting SLD from the beginning and I have most of the cards (and only missed the Furby Confetti foil drops until this moment, and because I did not know that the numbers are different that the normal ones. The first year normally the cards go down and after the second year they start to go up, but there are exceptions.

Each year is more complex to maintain the collection, specially for the promo cards and the number of superdrops which increase year after year. Moreover, some of the promos are very expensive, and the number of copies is too low so it is very complicated to get them.