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What our Arcane Blast junkie mage does (when he's specced accordingly), is the following:
Arcane Blast
Arcane Blast
Fireball / Scorch chain-cast depending on the situation (threat, current mana, importance of mobility etc.)
and the key part:
Arcane Blast as the debuff is about to run out. Why? He starts his cast while the 2-stack debuff has ~1sec left on it, so he gets the full benefit of the increased casting speed. However, the debuff falls off while he's still casting, and mana is spent at the end of the cast, meaning he just got a free high-speed cast, for low mana cost. After this cast, cast Arcane blast once more to get up to two debuff stacks once again, then continue with Fireballs/Scorch. Rinse and repeat.
Since you're likely to have Improved Clearcasting, you probably want to go with casting a Fireball whenever you're outside of the AB rotation and you have a CC proc, scorch outside of that to proc more Clearcasts.
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