Tomb + Polar Vortex

I'm playing a Djinni that got Polar Vortex as a L9 spell. I have one four-rune win Djinni win under my belt so wanted to try a little extended...

I've never done Tomb as a caster -- it's always been incredibly scary melee fighting with no AoE or ranged. This character now has Death Form, follows Mak, and has Vortex. Would it be as simple as dropping in and spamming the vortex, or are there other threats I need to worry about?

(I don't see myself going the 15-rune distance with this character, but would really value some perspective on tomb for a caster like this)