[Trigger] Help for harvest loop Trigger

[ParadoX[off]]

Ok I wanna make a map with ressources inn a multiboard (like goe2 (if someone knows))
I already got a spell "harvest lumber" a Variable Lumber
but I want that the unit casts the spell endless like
Lumberjack casts harvest
Wait 5 sec
and then let lumberjack cast it again on same tree
but I don´t find anything to do help plz

 

[TheBlooddancer]

Why dont you just use harvest?

And if you wanna trigger it, then goldmines would be easier.

 

[ParadoX[off]]

I want to make more ressources but at first 1 must work
I want to dor
Lumber
Food
Ore
Stone
Leather
Corpses (for undeads)
and maybe some more

Edit:
Noone knows who to make a trigger that a unit will loop a spell?
All I tried failed