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Library of Leng

Color= Artifact Type= Artifact Cost= 1 A(U)/B(U)/U(U)/R(U)/4(U)/5(U)
Text (5th+errata): You have no maximum hand size. ; If an effect causes you to discard a card from your hand, discard it, but you may put it on top of your library instead of into your graveyard. [Oracle 2002/03/01]

The ability replaces the normal discard action with a discard action that puts the card on the library instead of the graveyard. [D'Angelo 2000/03/03]
Since the card goes directly to the library, the card is not revealed unless the spell or ability requiring the discard specifically says it is. [D'Angelo 2000/03/03]
The discard triggers anything else that triggers on discards, such as Psychic Purge and Megrim. [D'Angelo 1998/07/17]
The text "you have no maximum hand size" means you don't have to discard down to 7 cards during your cleanup step (see Rule P.13.1). [D'Angelo 2000/03/03]
If more than one card is discarded due to a single effect, the Library allows you to decide whether or not to use it on each of the cards. [D'Angelo 2000/03/03] You get to decide the order the cards are placed on the library if more than one goes there. [D'Angelo 2000/03/03]
You can look at a randomly discarded card before deciding where it goes. [D'Angelo 1997/04/11]
The ability triggers on any spell or ability that has you discard as part of the effect. It does not matter if you or your opponent control the spell or ability. The discard is forced because it is an effect. [Oracle 1998/07/01]
The ability does not trigger on any spell or ability that has you discard as part of a cost. For example, Land's Edge. [Oracle 1998/07/01] Also, cards like Forbid, which have you discard as part of the buyback cost. [D'Angelo 1998/06/18]
If multiple effects modify your hand size limit, apply them in the order they enter play. For example, if both this and Recycle are in play, the most recent in play decides your hand size. [D'Angelo 2001/05/21]