NEED help creating a Trigger enhanced Spell

NEED help creating a Trigger enhanced Spell

I am currently trying to create a trigger enhanced spell..

It makes the spell caster disappear then summons 4 units in his place *that will be his shadows* then those *shadows* move to random enemy units and damage them..then the shadows disappear and the caster returns again..

HOW DO I DO THAT?!?

Just use a dummy unit that doesnt have locust and has attack damage. Then add 4 of the dummy for X seconds and remove them.

Also- to make him dissapear i would just put locus on him for those X seconds then remove it.