well there is no "set" rotation, more like a check list
1- is VT up? if not, cast it (vt is your #1 priority, it should always be up)
2- is SW:P up?
3- MB on cooldown
4- SW:D on cooldown (interchangable with mb, depending on what you want to cast first)
5- if all the above are up/on cooldown, then mindflay.
As you can see, vt and sw:p should ALWAYS be up, you're there to return mana to your group. MB/SWD on cooldown largely depends on your damage, the lower your damage, the less you should use these (since you will oom a lot faster) and mindflay should be used when all those requirements have been met. Use vampiric embrace anywhere in that rotation.
I believe vampiric embrace is the only spell you can cast on a mob that wont break a cc prematurely.
Edited, Apr 19th 2008 3:01pm by electricwizard