Macro with a modifier key AND changes spell based on spec or spell known?

[Elvenbane-veknilash (Elvenbane)]

#showtooltip
/cast [mod:alt] Heart Essence; Shadowmeld

Useful Macro Templates

In 9.2.5 Blizzard introduced a bug where the Self Cast Key interferes with @unit (mouseover, focus, etc.) and @cursor macros. If you want to use those types of macros, you need to change your Self Cast Key to None. If you want more info, or to encourage Blizz to fix the bug, please see this thread: General Macro Templates Dragonriding Mount Macro 10.0.7 Edition #showtooltip /cast [advflyable] DRAGONRIDING_MOUNT; [flyable] FLYING_MOUNT; GROUND_MOUNT /dismount [mounted] Pre-10.0.7 Edition #…