Back again, I've got alot of idea's flowing, so bare with me.
I was thinking about Momentum. Yes, gravity does have the ability to give someone momentum, hurling them forward past all barriers, but it can be used as a defense as well, bog down the creature in a well of gravity, tire them out and weaken their attacks.
Thus, HINDRANCE!
for 2
, same price as momentum, you cancel momentum effects on a creature, and they gain -3/-1
The number's might need a bit of tweaking, but it was hard to balance hindrance with Momentum's ability to overcome shields.
The upgraded would cost only 1
Again with the picture problem, I need an artist.
(
http://www.screenshotdumpster.com/view/m7Gbd46020/Hindrance)