If your Helper gets crit and you only have one, restart, you won't be able to get the combo rolling before it dies.
Relies on the Ice Tomb / Blizzard / Ice Lance combo. If you have multiple Helpers at 25, that'll work even better for you, but I only had the one. I'm mostly just posting this to confirm that it works even with only one.
You will need a second and third pet to mop up, so choose accordingly. I had a S/S Flayer Youngling (2/2/2) and Hogs (1/2/1); the latter only needed to soak the explosion from the last dog. YMMV.