Just a note, make sure that you replace "t6" in that macro with whatever the name of your actual macro is, or it won't work.
Originally Posted by celinamuna
The quoted macro will work properly if you have your T90 talent set to its own keybind (ie, there are 2 different spots on your action bars, one bound to "2" and one bound "Alt+2").
You can also just bind one action bar slot (to the "2" key) and, as long as "Alt+2" isn't directly bound inside WoW's keybindings, place this macro in the 2 slot to take care of both:
/use [nomod] Holy Holiness <--- your spell bound to 2
/use [mod:alt] Light's Hammer
/use [mod:alt] Holy Prism
/use [mod:alt] Execution Sentence
/run local G=GetSpellInfo SetMacroSpell("t6", G"Light's Hammer" or G"Holy Prism" or "Execution Sentence")