Text (6th+errata): Discard X cards, then return a card from your graveyard to your hand for each card discarded this way. Exile ~this~. [Oracle 2009/07/08]
The cards are discarded from your hand during resolution. It is a forced discard, so it can be used with Library of Leng. [D'Angelo 1999/05/01]
Choose which cards in the graveyard are being recalled during resolution. [D'Angelo 1999/05/01]
The "{X}{X}{U}" mana cost is not a misprint. It means to spend one blue plus two times X generic mana to cast the spell. [Duelist Magazine #2, Page 7] See Rule 107.3.
Vintage tournaments (see Rule 911) restricted this card from 1994/08/01 until 2003/04/01.
Legacy tournaments (see Rule 912) banned this card until 2003/04/01.
Standard (Type 2) tournaments (see Rule 914) restricted this card from 1994/08/01 to 1996/04/01.
