A simple Card deck Rig, that i've made for this commercial:
The materials are just plane colors, textures are not included!
Well, it's just a bone chain, controlled by an IK (bones visible in front and the one on the back)
every bone in the chain has one child bone that inherits the rotation and position but NOT the scale (so the cards stay the same scale). All them are in other hidden bone layer.
The third visible bone (vertical one named "slide") can slide the cards in their Z local axis, and can rotate too, for adding extra movement.
here's a illustrative video so you can get the idea:
Of course, this is a very simple rig, as my skills in this area are very limited, but feel free of improve and share!