Will do in the next patch! (the "moving to legendary tier" part I mean. it's definitely too weird for a green. you either have capped crit and a busted green item that carries the entire run, or zero crit and a near-useless item. bumping it to red tier, giving it a bit more crit chance and *maybe* slightly more damage would make it better)
On a second thought, maybe it could do with no balance changes *except* it can proc only once per second (with a cooldown debuff, kinda like bands)?