Code:
Unit Group - Pick every unit in (Units in (Playable map area) matching ((Unit-type of (Matching unit)) Equal to Dummy Target)) and do (Actions)
Loop - Actions
Animation - Change (Picked unit)'s vertex coloring to (0.00%, 0.00%, 0.00%) with 100.00% transparency
I don't understand why it won't make the unit not show up...the model is the missile for the spirit of vengeance.