target of casted ability...possible?

What do I use to define the target of a casted ability? I want to do something like this:

Event: A unit begins casting an ability
Conditions: Ability being cast is equal to xyz
Casting unit is equal to blahblah[1]
(??victim of casted ability??) is equal to yomama[5]

something like that, you get the point.
how do i define the target of a casted ability?

E- a unit issue order to an object
C- unit type of(ordered unit) equals to xxx and issue order equals to yyy
A- set yyyTarget

E- a unit starts the effect of ability
C- ability equals to zzz
A- create SFX on yyyTarget (or whatever you want)

- ByTe.ME uswest

I don't understand, can you use a bit better grammar and more precise wording?

Create a unit variable named myspellTarget
Create a SFXarray varibale named myspellSFX

E- a unit issue order to an object
C- (unit type of(ordered unit)) equals to () <--- your unit that has the custom spell
C- issued order equals to order(shadowstrike) <---- since I based my spell off shadow strike, that would be the order string
A- set myspellTarget = target unit of issued order

E- a unit starts the effect of an ability
C- ability being cast equals to () <---- insert your custom spell here
A- Create an SFX[1] at origin of (myspellTarget) using blah blah blah.mdl
A- set myspellSFX[1] = (last created SFX)
A- wait xxx game time secs
A- destroy myspellSFX[1]

- ByTe.ME uswest