Nevermore | Magic: The Gathering
Formats Nevermore is Legal in
Official Oracle Text for Nevermore
The named card can't be cast.
Official Rulings for Nevermore
9/22/2011 : Spells with the chosen name that somehow happen to already be on the stack when Nevermore enters the battlefield are not affected by Nevermore's ability.
9/22/2011 : Although the named card can't be cast, it can still be put onto the battlefield by a spell or ability (if it's a permanent card).
9/22/2011 : You can name either half of a split card, but not both. If you do so, that half (and both halves, if the split card has fuse) can't be cast. The other half is unaffected.
9/22/2011 : If you want to name a double-faced card, remember to name the front face of that card. (The back face can't be cast anyway.)
9/22/2011 : The named card can be cast again once Nevermore leaves the battlefield.