You need to be specced into it first, it does nothing without that. It's also best to use a macro where it cast LB first, then you spam the same macro to fire Death Coils to yourself, you need to pool Runic Power before hand.
Originally Posted by Darksend
Best bet also is find 2-3 healers you know to q with and tell them to forget everyone else and just keep you alive.
Don't expect you to spam yourself to full health. there are only so many Deathcoils per full rune bar, and lichborne only lasts so long. Now if Frost had access to the old Rune Power from AMS (now a deep unholy talent), that would be nice, but I doubt that is going to be viable in general.