Nice. Card finally made it. Decent, helpful, not gamebreaking card - just the type we need more of.
Now Gravity benefits from sacrificing own creatures... khm... I think we need a
version of Trebuchet that deals poison counter by sacrificing creatures, as you know, those things were often used to fling disease infected corpses of humans and animals to spread disease in sieged town.
Also, I know this was a long awaited
card, but its a bit ironic. Its a weapon built practically to
counter the effects of gravity, and most catapults actually used rope torsion to get energy for hurling the object. Practically the only catapult that actually used gravity force to some extent was counter weight trebuchet.