There was a CCG called Warlord: Saga of the Storm that I played briefly in its relevancy. It was the only CCG I played where positioning was a main element. Ranged attacks, etc. The accompanying image is low quality, but shows an example of unit placement based on ranks.
Mostly I am just wondering if this concept saw light in other card games. A board game like Mage Wars uses placement with cards, but also requires a board.
I also wonder if there are traditional playing card games with the element of strategical card placement?