When a sloppy worded rule meet a will of respecting it precisely then a nonsense is exposed.
"(Foo) only" cards can only be played by characters with the (foo) skill.
Gnaw with Words wrote:Tap a sage if another sage in his company or at his current site or at his new site. Alternatively, tap a diplomat if another diplomat is in his company or at his current site or at his new site. 'Small comfort will those two have in their companionship: they will gnaw one another with words. ...If Wormtongue ever comes out of Orthanc alive, it will be more than he deserves.'-LotRIII
Any card requiring a sage to play is a sage only card.
Does Gnaw with Words require a sage (in first use)?
Is it a sage only card?
If so, is Gnaw with Words played by sage?
Something is not right here. And I bet that it is the first quote.
I will correct it in competing thread.