Cycling seems to be a good way to recycle the wrong land or too much land out of a deck. It was first in Urza's Saga and then in Onslaught-and the latter were reprinted in Vintage Masters; and then in Alara Reborn (mostly, some of the other sets in these first two blocks also have Cycling cards).
The Circle of Protection cycle from Alpha-Beta-Unlimited (ABU) was redone in Urza's Saga as a Rune of Protection cycle with iconic and beautiful artwork.
Cycling seems to be a mechanic for limited fodder. Here is the Sojourners cycle from Alara Reborn. You have to spend mana to cycle these, and they give you a small bonus for doing so.