From the Looney Labs store:
This is a rare, mis-printed version of the promo Goal card called the Forest.
It's just like a standard-issue Forest, except that the artwork is printed as a negative image. A bunch of these "Night forest" card were made by mistake, but rather than just pitching them, we decided they're actually kind of cool. (We have a House Rule for this card: To win with the Night Forest, you need 2 or more Trees AND the Moon must be somewhere on the table.)