Text (TE+errata): As an additional cost to cast ~this~, discard X cards. ; Look at target opponent's hand and choose X cards from it. That player discards those cards. [Oracle 2009/07/08]
You discard as part of the cost paid when announcing the spell. [D'Angelo 1998/11/02]
X can be zero to just look at their hand. [D'Angelo 1998/11/02]
