This was a part of a tutorial course I made for my students.
You can use it as a magical hands for a magical show that pull a rabbit from a hat. Or here is a great idea: create and rig two eyes (only eyes, not an entire head) and add it to the hand rig so you can have really neat cartoon character to animate.
The blend file contains: 1. a low poly model (also rigged). 2. Tapping animation. 3. Five defined poses. 4. Pinky finger driving a shape key to push the inner hand skin as a deformer. This is just for showing the possibility of doing it, because when animating any finger you can't depend on the orientation of that finger due to how you want to animate by adjusting the rotation constraints ..etc.