If the fight is shorter that you want to take WoTLK Gold, you know, so like right now I can do a number of casts pass in order to get the missile barrage Croc even though it's more mana-intensive.

I'm able to afford it when it's a less intense bite but if you're in a longer fight, you'll need to reduce that number down a bit. In order to be able to accumulate sufficient mana as you want to try to go to four stacks, if you do have use missile barrage on lower than four stacks, it's going to kill your DPS in a significant amount.

Now obviously it's more mana productive, yet WoTLK Classic Gold it's also going to hurt your DPS. A second thing to consider is that you shouldn't stop your casting to make use of this missile barrage proc.