Samara packs a lot of features into a small space, and does a great job at it. While it can be used to mix audio and CV (with the ability to both invert and offset both), it is as a CV or LFO 'mangler', in my opinion, that it shines.
I primarily use it as a means of adding interest and variety to standard LFO shapes, thus making for more interesting modulation. It has 4 modes of manipulating CV: Min/Max, Scan, Clamp and Sample and Hold. These modes, plus the mixing, offset and attenuation features, means that Samara can be used to add a lot of interesting modulation to a patch.