Sneaky-Sneak after combat?
 

The Sneaky-Sneak card says it can only be used if you are in the combat... but doesn't say anything about "Use only once" or "Discard after combat"... so, where does it go after combat? I would assume the discard pile?

Re: Sneaky-Sneak after combat?
 

This one would come under the category of Specials:
Now, as the bonus is technically not persistent (you only get it once you use it, so it is not giving you a bonus at other times), you should discard it after the combat in which it is used.

Re: Sneaky-Sneak after combat?
 

It's important to remember that just about any card that is not an Item, Race, Class (or similar thingie), persistent curse, or Treasure that doesn't give a persistent bonus is going to follow the play-resolve-discard dynamic, which means that it doesn't have to say "usable once only" like an Item would need in order to be discarded once its effect is over. There may be some exceptions to this, but they should be recognizable given the text on the card itself.