Quote Originally Posted by Darkstarz View Post
just use this

/macroicon "Thunder III"
/ac "Thunder III" <t>
/ac "Thunder II" <t>
/ac "Thunder" <t>

Will cast whichever you have mana to fill, if you cast Thunder 2 or 1, you will need to scathe/blizzard tho.
Only issue is that macro's don't queue up. Hence the reason I went away from this sort of thing.