need help for a Transforming spell

[13lack.1)ragon]

well ive decided too make a hero that can alter its model and abilities yet keep its agil,strength,intel,dmg,hp yada yada. ive tried using a possesion spell and using trigger to recreate the possesed unit for the original owner of it. unfortunetly it gets stats and crap of the possesed dude and IT cant ''re''transform back whenever anybody know how ya could do this :?

 

[Ramza]

get WEU. there u have this function: 'replace unit' that will keep stats