With the arrival of the Icy Veins talent, mages want to use this speed increase as much as possible.

Fortunately, you can build it right into your existing Trinket Macro.

Significantly, this spell does NOT trigger the global cooldown (GCD). Neither does Combustion. So, a macro like...

# showtooltip Fireball
/script UIErrorsFrame:Hide()
/use 14
/use 15
/cast Combustion
/cast Icy Veins
/script UIErrorsFrame:Clear(); UIErrorsFrame:Show()
/cast Fireball

...will work when you spam it. (One way to do this really well is to bind this macro to your mouse scroll-wheel..when you roll the wheel it's like clicking really really fast). The above macro also triggers any on-use trinkets.

So basically you can activate your trinket, Combustion, and Icy Veins all at the same time, and if you're spamming this macro, whenever the cooldowns are up, you'll automatically pop them again.

A few things to keep in mind:

1. Combustion's cooldown doesn't start until after you use up the crit buff, not when you pop it. So even though both IV and Comb have a 3 min cooldown, they get out of sync right away.

2. The benefit of popping IV with Combustion is limited. Basically you'll just chew through your Combustion a bit faster, thereby triggering the cooldown to start a bit earlier...but not by enough to make it significant.

3. By being 'lazy' and using this macro you run the risk of doing too much damage early on in a fight. If you're raiding, chances are that if you're setting up for a pull you might have all your cooldowns available. If you pop them all together right away, you might push your threat too high. (They buffed mages in 2.3.2, not the tanks' ability to hold aggro.)

4. By being 'lazy' and using this macro you run the risk of popping the trinkets/IV/Comb at a time where you won't fully use them. For example, during fights where you need to stop casting to move (Lurker), or stop casting for aggro reasons (Leo), you don't want to pop them right before you have to stop...otherwise the goodness that is IV will be wasted because you won't be casting.

The solution is to create two different fireball macros. One 'lazy' one above, and another that doesn't pop the IV or Comb (or even trinkets). Just a straight-up Fireball (FB) spam. Use the plain FB spell at the beginning of fights, right before times in the fight when you have to stop, or if you are trying to sync up your cooldowns for a sudden burst of dmg.