It's pretty good, in my opinion.
The main problem with it is that other then Elements, it doesn't have much to offer, AND you need a combination of creatures with at least all elements but Air. Still, if you have a multi-element deck that could use a Creature and already has the correct utility, put it in. (Or an element deck in general, it's really nice!) It's got quite a few Battlegear that work with it, though!
I wouldn't really recommend using it brainwashed-it's certainly not bad, but it's a gamble, and there's probably better slots for other Creatures at that point.