Is it called sparkburst in-game? That info site from one of these threads lists it as zapper.
Pyrobomb has the same invincibility frame but a much quicker recovery. In fact, it's possible to beat Arma without losing any hp by going around in a circle and pyrobombing as she throws the sawblades (they only hurt when returning), provided she doesn't bust out her machinegun, move away really fast or back up into a wall. It's also my main anti-Griff and anti-Charme spell since they get knocked down with Sparkburst.
I haven't been screwing around with the bosses yet, but damn, that sounds like fun. The no knockdown damage looks sweet despite the risk of closing the distance.
It also has really good upwards range, and you can clear floating pumpkins and bees easily. Not to mention it's not blocked by obstacles unlike Sparky, which is really useful when trying to hit that bomb under the crab boss. Cost effective too - it only costs 5 SP per use.
Didn't know about the air-attack thing. In that case, it makes it better that force gemini when dealing with those damn flyers. But, everything on the ground is still cheaper and to kill with the similarly-priced zap.
Ice Mine is great as a makeshift wall or spawncamp trap. Try it while doing a bossrush with Samhains and throw one while they disappear. Since they like to move around you in a circle there's a good chance you get 5 free hits on them, or at least knock away that pesky fire ghost while you Sparkburst the main threat into tiny tiny gems.
I used ice mine on samhains at first, but I found it easier to just spam zap with the occasional spinning around. It kills the samhains faster and the spinning interrupts casts from ghosts. What really kills ice mine is the slow recovery and cast since it gives enemies an opening to approach. It's much faster to point sparks in the general direction you're worried about.
Also, Geddon Device becomes an even funnier joke - set 5 of them on the same spot and watch as he lands oh so gracefully on them and suicides.
I'm still on the way to that boss so I guess I'll try this out. But yeah, I guess ice mine would shine if you had the time to set it up.