[Spell] I'm stuck. How do I make a spell that pings the map by units of type?

[WolfChalk]

I've been experimenting with triggers but nothing I've done has really worked. Could someone help me out by assisting me in how to do a spell that pings the mini map for units of type nearby to the casting unit? Idea is for my map this trigger would make finding herd members for your stallion easier vs roaming the whole map lost af with no clue where to look first. If anyone knows, thank you in advance.

This was my last failed attempt:

• Call Horses
  • Events
    • Unit - A unit Begins casting an ability
  • Conditions
    • (Ability being cast) Equal to Call Out
    • (Unit-type of (Casting unit)) Equal to Lead Stallion [Black]
  • Actions
    • Set VariableSet Temp_UG[1] = (Units within 8000.00 of (Position of (Casting unit)) matching ((Unit-type of (Picked unit)) Equal to Mare [Chestnut]).)
    • Unit Group - Pick every unit in Temp_UG[1] and do (Actions)
      • Loop - Actions
        • Set VariableSet Temp_Pt[1] = (Position of (Picked unit))
        • Sound - Play KnightNoRiderWarcry1 <gen>
        • Cinematic - Ping minimap for (All players matching ((Matching player) Equal to (Owner of (Casting unit))).) at Temp_Pt[1] for 4.00 seconds
    • Game - Display to (All players matching ((Matching player) Equal to (Owner of (Casting unit))).) for 15.00 seconds the text: Your Stallion calls...
    • Unit Group - Remove all units from Temp_UG[1]

 

[Cheshire]

try changing this:

• Set VariableSet Temp_UG[1] = (Units within 8000.00 of (Position of (Casting unit)) matching ((Unit-type of (Picked unit)) Equal to Mare [Chestnut]).)

to this:

• Set VariableSet Temp_UG[1] = (Units within 8000.00 of (Position of (Casting unit)) matching ((Unit-type of (matching unit)) Equal to Mare [Chestnut]).)

picked unit -> matching unit