some help with a spell

some help with a spell

i want to make a spell that stuns all people on the map all at once what do i do?

this sounds dangerously laggy but here goes. one thing that might work is setting the range on an ability like thunder clap to 99999.99 or 99999.00 both just as effective . the other thing that might work is a trigger that adds a buff to every unit (not sure if that will work) the last idea is get someone to do it in jass (not me, im no good). im reasonably confident on the first one.

Don't forget to remove the Special Effect on Thunder Clap, or remove all damage.
You could however just create a trigger to grab all units in Playable map area and do Stun-or Pause all units... it's really not that hard to do, I have never attempted it, but I know how easily it can be done.