
These are some of the champions who might like this item, due to poor clears, high mana costs, and/or spammable skills.
The thing is, a lot of those like to build Lich Bane already, which makes this item seem like somewhat bad value (or will at least force them to change up their builds.)
In terms of actual balance, I think the item is still in early days and will probably get tweaked a bit in the next patch, so let's ignore its power level and instead focus on what it does:
- Low-ratio AoE magic damage - helps clears
- Small amount of mana sustain - stop mage-junglers from running out of mana as much
So, it would help someone who has trouble clearing and who generally runs out of mana, while also having fairly low-cooldown abilities.
What it doesn't provide is health sustain, which is something that I think most non-Fiddle mage junglers are missing.