The first (and only, thus far) chest I opened contained Shield of Force Resistance, Ataxian, Merchant, and Force Quarterstaff +1.  As you can see from the four screenshots, all four cards, with the exception of Merchant, have the proper Type buttons highlighted when the appropriate Deck is selected.  For Merchant, though, the Ally Type button is not highlighted while Deck 2 is selected.  This was while viewing the Gallery in the main menu.

The first (and only, thus far) chest I opened contained Shield of Force Resistance, Ataxian, Merchant, and Force Quarterstaff +1.  As you can see from the four screenshots, all four cards, with the exception of Merchant, have the proper Type buttons highlighted when the appropriate Deck is selected.  For Merchant, though, the Ally Type button is not highlighted while Deck 2 is selected.  This was while viewing the Gallery in the main menu.

So the Merchant is a place holder card right now for Legendary cards.