[quote=@LordofthePies]
I think the whole growing a tale thing would put him in rare. I dunno though. 
[/quote]

I'm good with you making him a Rare but that would cause more changes than a change of ears and a tail(Includes the eye color change). 
I can explain more if I need to, I can be a little confusing at times

Common Morphs(1 or 2 changes)
* Fangs or talons
* Patches of fur, scales, or etc.
* Possible gill formation
* Ear changes and tail formation
*??

Rare morphs(5 changes) 
*Any above traits plus(Uncommon or Common) 
* Complete skin transformation 
* Bone spikes(exoskeleton) 
* Added organs and/or limbs: heart, eye, arms, or etc
* Change in shape/structure 
*???(Come up with something)