This looks like a fun card. Might I suggest perhaps something like -this-?
Camouflage//Concealment 2
// 1
Permanent
Target
creature slot cloaks whatever creature it contains from your opponent. Any opponent's spell targeting this slot destroys camouflage first instead of affecting the creature.
I think this would be a lot cooler, because you could play it on whichever slot was next going to have a creature placed into it, and then play a creature in it where your opponent might not be sure what it is, especially if they weren't watching too carefully. Right now, it's usually fairly obvious, due to almost no creatures sharing a cost, plus when you attack it will often be even more obvious, but as more creatures are added it will become better. It would also allow for some very hilarious synergy with fate egg and mutation and nymph's tears, as your opponent would be uncertain what was there, at least at first. This version would also be vulnerable to PC, but if it were not destroyed, it would still be there for use if the creature died, and you replayed another creature in the same slot. (though as I've worded it, this could only happen if the creature died to fire buckler/thorn carapace, or poison that it already had, or was sacrificed by the owner, like virus or immolation)
Dunno what you'll think of the idea; I don't expect you to use it at all, but I'm hoping to fire the imagination of yourself and others with it