Hello Pojo fans!  I just figured out a relatively slow but amusing combo involving Call of the Wild (6th edition) and Goblin Spy(Invasion)
Call of the Wild states:
2GG: Reveal the top card of your deck.  If it is a creature card, put it into play.  Otherwise, put it in your graveyard.
Goblin Spy states:
Play with the top card of your library revealed.
I do realize that this combo is prone to many decks, is slow, and will most likely never see the light of day.  However, it's an interesting idea.