Library of Leng
Does not work the way it should with cycle cards. It allows Street Wraith to cycle as a cost and put it on top, which it should not allow. But it does not work with other cycle cards. In certain instances, such as with Vizier of Tumbling Sands and Esper Sojourners, cycling the card does not trigger its effect, even when sent to the yard.
confirmed, no option to choose top of library as the ending place for discarded cards.
I have encountered this issue as well, with Lay Claim.