I like the idea of an ability that's simply converting Adder's Gall into an Adder's Sting + some MP. Yeah, it could be a damage gain in AoE, but on trash pulls you actually need the Adder's Gall healing abilities usually, so it shouldn't be that much of an issue, especially since most DPS-focused Sages will most likely already get their Sting stacks from shielding during pull and later on it's much better to use the Adder heals than have to gcd.

In boss fights it would just be a nice way to get extra mobility when there's no need to gcd shield, so I doubt it would be spammed as much as ED, if people are so afraid of it.

I'm not partial to just letting SGE apply more ogcds shields with it, because that makes the gcd ones even more useless than they usually are in this game.