This also stops "Helpoemer"'s effect that forces your discard while he's in the grave. This could also be chained to Frogs, such as "Treeborn Frog" or "Ronintoadin" which bring themselves back from the grave.
This can be used as an alternative to "D.D. Crow" or "Disappear" if you or your opponent has an "Imperial Iron Wall" on the field. The card will be sent back to the deck and have to be searched out again to be used again.