I do think this dragon needs a buff, but 9/50 is a bit too much I think, Think of it as a Basalt Dragon sacrificing 1 attack for 38 hp? That's beyond insane (possible implying basalt dragon just needs a buff as well). Momentum doesn't sound too bad, and maybe change it to 9/20, by the time you get to play it, it won't make a huge difference from Chargers anyway, which are hard enough to deal with.