I see a lot of pitful replies.. so I'll try my best to clarify. I'm 94 mage btw.
I hope you're kidding. The only reason you would do that is if you were stunning.
But anyways. to OP, if you don't want to lose money, go to the red spiders in 40 wild, by the kbd lair, with some antipoison++ potions and tele runes, and hop to a PVP world. Bring your stuns and anything to make youre mage bonus -65 or worse. Stun the spiders, and you'll gain EP while you're at it. If someone comes and attacks, pull the lever and teleport inside, and then hit your tele out (the King Black Dragon lair is not considered wilderness)
You could also high alch in here. For alching, use onyx bolt (e), green dhide body, rune full helm, rune dagger, rune longsword, and magic longbows. Any of these is fine (rune dagger being the least loss).
otherwise, you can stun pretty much anything, doesn't matter, but you won't gain EP to farm gold off. The costs are at approx. 4.1 gp / xp.
Barrage / burst, not blitz.. blitz is only one target. and this would cost him far more than 20m.
Fire striking at iron/steel dragons is pitful experience and the rate at what you kill them won't make up for the amount of potions you use.
If you choose to do that, only fire wave them. Actually, this is a great way to gain XP (a min. of 47.5xp per cast, plus with average damage at 7, a total of 70xp average / cast- about 84k an hour). The cost per xp is much higher for fire bolt- about 12 gp/xp versus the fire wave's 6.3 gp / xp per xp. visage drops are sexy.
