Apatheist got it right. Additionall, you can go arcane power and PI if you run power infusion and do 50% more dmg on any spell. You can also go blastwave paired with arcane explosion too but Arcane explosion is the best spell in game with stacked mages. I mean, with descentish spell power it can hit for 600,700 per application. Given that most classes have 4k hp (with solid gear) you can kill them in 1 gcd, perhaps 2.
You blink to people arcane explosion>gg. For single targets you can arcane missles, fireblast if they are far away or scorch.
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