Grab Necromancy and Kinetic,
make Control Based Necromancer Spells and kill the enemies with Kinetic Damage.

The undead minions' attacks will make the enemies float. Ranged units are best for that.

Looks rather surreal and in my opinion quite hilarious.
Having a squad of baddies floating around while you enjoy some target practice and live skeet shooting is every archmage's dream.

Any other things to do?

Use Kinetic's AoE spell to stop enemies, then use Phase's AoE spell to cast bubbles on the enemies. After that, pump the bubbles with a Corruption spell(destruction attuned) 3-4 times. The bubbles will absorb it. Finally, cast destruction attuned Phase spell on the bubbles.

What it does? It kills the enemy instantly, starting the slow-mo effect. The bugs from the Corruption spell will go from killed enemies to the ones that are alive. What's more, when they start attacking them, they'll also cast Phase destruction spell on them, thus teleporting them across battlefield.