Hm, well, it will synergize well with the Gravity element as a whole and does help the Life element a lot with CC issues, although only protecting one creature isn't as effective as in other more "tall" elements like Light.
Seems a little plain, but I suppose simple is good.
Also, I doubt that the cost raise on the upped is necessary. Gaining +0|+4 isn't that big in the current metagame (since it only really deals with hard CC and Gravity mechanics). I suppose almost getting enough to heal off a Rage Pot isn't too shabby, but honestly, that's a lot of investment in a single creature that can easily be RT'd (and it can't even be quinted since you have to target it).
Anyways, overall I'd rate at about 4/5.