Make Parasite look like FN

Is there a way to Give Parasite the Appearance of Frost Nova? I have been trying. I just want the unit to have a slowed effect, and have the FN blast on him. Basicly what I am looking for is a good way to make an Auto-Cast Frost Nova. Anyone know how to do what I need or have suggestions?

... Just give the original parasite. Add a trigger that creates a dummy frost nova caster each time parasite is casted. I'm quite sure this kind of autocast ability sets the triggers off.

I am trying to get away from that tho. Becuase that needs me to give teh unit 2 abilties, and it doenst look so good.

First of all you don't have to give the unit two spells, no one will ever notice the dummy unit.

Next, the problem here is that the effect for frost nova is an <Effect> type SFX while the parasite skill uses <Target> or <Missile> type SFX. Generally, <Effect> type SFXs don't mix well with skills they aren't designed to be used with.

In any case, you're going to have to do the freezing effect SOMEHOW, so you might as well use a dummy unit to cast frost nova from the start...

Alternatively you can make an orb ability that casts frost nova. That way the unit can be made to cast frost nova on everything it attacks.