Enchanter - Chaotic Feedback spell

[GrimSloth]

Hello, I was wondering if I need to pick up this spell. Mana wise it seems really inefficient currently. Additionally, it overall deals less damage than Choke while having very small mana difference. Of course, you can spam it, which will add up to more damage, but again, the mana cost just seems too high for it to be effective and you will inevitably pull aggro if you go that route. Does it become more useful later on?