and I plan on spamming it a lot. I remember seeing a post showing a line before and after the /cast that would disable the sound and/or red text on the screen, but I can't seem to find it. If anyone could help it'd be greatly appreciated.
/use Lower City Prayerbook
/cast Flash of Light
(the stopcasting is for chain-casting on oceanic latency, it's not strictly necessary for the macro, hitting a trinket doesn't cause a cooldown. If however you were to roll Combustion into it you'd need to hit Combustion, /stopcasting, then the spell you want.)