Text (MI+errata): As ~this~ enters the battlefield, you and an opponent each name a card other than a basic land card. ; The named cards can't be played. [Oracle 2009/07/08]
It does not target the opponent, but you still choose an opponent. [WotC Rules Team 1998/02/01]
Cannot stop a creature from being put into play through an effect, such as Flash. [bethmo 1996/11/07] Also Animate Dead, Ivory Gargoyle's trigger, and so on.
Does not stops cards from being put into play under Eureka. [D'Angelo 1999/02/16]
The caster chooses before the opponent. [bethmo 1997/09/13]
