Predator total damage
22 minute game on Ascension, with 5/5 Ingenious Hunter, and was pretty much spamming it off cooldown. A whopping 800 damage.
In contrast, 
Electrocute had 1.6k in a 16 minute game.
I guess it was limited to cooldown and a standard 30 minute SR will see a few more uses (and more damage) but if you consider that, the other keystones would have probably quadruple the amount done by then. Feels like it only works on Hec because of his passive, otherwise it's a shitty keystone.
