I keep meaning to try a Unicorn, I need more healing in my Beast Master book overall.
The thing with the raptor is it gives them a much needed boost to armor and life. In addition the combo of Spitting Acid to Corrode one turn and then 5 Attack with 1 Piercing for whatever armor they have left the next turn has been fairly effective for me. I'm also partial to Cheetah Speed on all my pets and with the raptor it becomes a fairly nice little threat this way.