alas, no fear matey here is the trigger...
just replace the X's in the IF/THEN/ELSE with your own numbers, and add an exploding action in the actions under the IF/THEN/ELSE as well...
For my trigger, i used an albatross as a unit..enjoy
AlbatrosExplode
Events
Player - Player 1 (Red) Selects a unit
Conditions
(Unit-type of (Triggering unit)) Equal to Albatross
Actions
Set AmountOfClicks = (AmountOfClicks + 1)
If (All Conditions are True) then do (Then Actions) else do (Else Actions)
If - Conditions
AmountOfClicks Equal to X
Then - Actions
Special Effect - Create a special effect attached to the overhead of (Triggering unit) using Doodads\Cinematic\TownBurningFireEmitter\TownBurningFireEmitter.mdl
Else - Actions