Life Drain + Siphon Mana

[MasterRofl]

If I give a unit both of these skills, how do I make it so that when one is casted, it doesn't trigger the other?

 

[vypur85]

Any unit at all cannot have more than 1 active ability which has the same Order String (changing this in Object Editor won't do anything). So, I think it's impossible? Not sure if both the skills have the same order string though.

You may need to trigger one of the spell.