One Shotting Is Here!

[Rinnhart]

This depends on your definition of rare.  Maybe it's rare for a fire mage, who can't control his crit chance at all.

The guy I mentioned--I've talked about mage builds and gear with him, I've done raids with him, I've done BGs with him, I've modelled some of my gear after him, and tested out a less crazy-go-nuts version of what he's doing.  The only thing deciding whether he gets a one-shot or a two-shot is, one, if his cooldowns are up (and it's only three minutes--you can't just burn it whenever you want, but if you're careful and you really need some burst damage, it's there), two, whether the frostbolt is resisted, and three, if the frostbolt crits.  About a five percent chance to resist means it's really not very common, and isn't too hard to follow up with another frostbolt, or a series of high-damage instant attacks.  Shatter + Frost Nova = about 60 percent chance to crit; it's certainly not every time, but constant enough that if you can manage a spell or two then you're gonna get a crit. 

The one-shots aren't every fight.  But they're definitely not rare.

And even trinketless, without AP, all the spell damage gear means a normal frosbolt can still crit near 2,000 damage.
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Who needs to one shot when you can slip a CoC in with that frostbolt so they both benefit from the shatter?