Probably an easy macro?

[Elvenbane-veknilash (Elvenbane)]

So easy it’s already in the pins.

@Elvenbane-veknilash

Basic Help/Harm Macro

This will cast one spell when mousing over or targeting a friend and another when mousing over or targeting an enemy.

#showtooltip
/cast [mod:alt,@player] [@mouseover,help,nodead] HELP_SPELL; [@mouseover,harm,nodead] [harm] HARM_SPELL; HELP_SPELL

Variant: HARM_SPELL as Default

#showtooltip
/cast [mod:alt,@player] HELP_SPELL; [@mouseover,harm,nodead] HARM_SPELL;[@mouseover,help,nodead] [help] HELP_SPELL; HARM_SPELL