I Need help with triggers effecting abilitys with no target.

What i need is a trigger that will let me effect a unit that is effected by an ability with no target, Like War Stomp or Essence of Blight.

I tryed:
Event:
Unit- A unit begains casting a spell.
Condtion:
(Ability being cast) is equal to Essence of blight
Action:
Unit- Set Hp of (Unit being targted by casting spell) to 100%

But that does not work.

I would try to set the trigger so it starts when any unit that has a Buff gets there HP set to 100%, but theres no trigger for buffs.

You just made one small mistake;
There you go. There's noone being targeted by the spell.

That will only heal the caster. What about the other units that are effected by the spell?

Just pick every unit owned by the owner of the casting unit within (whatever range you want) and set life to 100%

Couldn't you just use a scroll of healing with a big regeneration value?

Well, you see, that's the obvious choice. Who would ever go with those? ^_^