For example, searching for Guard (with the intention of finding a Clock Card), only returns cards with an effect related to Guardians.
http://db.irowiki.org/db/card-search...ype=0&sort=1,1
http://db.irowiki.org/db/item-info/4299/
http://db.irowiki.org/db/card-search...ype=0&sort=1,1
http://db.irowiki.org/db/item-info/4299/