Grail Knight's ( http://deckbox.org/whi/Grail%20Knight ) text states that "Lower the cost to play this unit by 2 while you have a Quest in play."

If my opponent has placed Snotling Invasion in one of my zones "under my control" Does this count as "a A Quest in Play". Granted, I have not played a quest, but a quest is in play under my control. Can anybody help me out on this one?

He should work I think.

I'm not sure it is "you" who have the quest in play, even though you control it?