Macro for Viper/Serpent sting

Hi,
is there any way to make a macro for Viper sting for mana using mobs and Serpent sting for mobs that don't use mana?
I tried
#show tooltip
/cast Viper sting
/cast Serpent sting(Rank 10)

but it doesn't seem to work. Any suggestions?

No, there's no way to make that on an automated basis.

Only thing you could do is use a modifier to bind both to the same key.

Would look something like this:
#showtooltip Viper Sting (or Serpent Sting, your choice)
/cast [nomod] Viper Sting
/cast [mod:alt] Serpent Sting

There is a way, I used it a whole lot on Nostalrius. I found it on some forum. it differentiates by resource. I just saw this post while looking for that very macro again

Viper & Serpent
Tip: If the target has mana, it hits it with Viper and if not, it hits it with Serpent.

/script if UnitPowerType(“target”)==0 then CastSpellByName(“Viper Sting”) else CastSpellByName(“Serpent Sting”); end

I got this from another forum and willing to test it tonight, hope it works.

Hey buddy, I got this one works for me:

#showtooltip
/cast [harm,nodead,mod,@targettarget] Viper Sting
/cast [harm,nodead] Serpent Sting

Sorry for the necro, but I'm looking for something to do exactly this and none of what's listed here work for me. Any other suggestions?