Sheep Tag Triggers help?

[MicroSheep]

yeah so the whole map is fine..

But then when i try to make "delete last farm" trigger, its not working for me.
I dont know where to start.

I tried to make it so that

Event
A unit finishes construction.
Condition
Action
Add (constructed structre) to DeleteLastFarm.

Then i did

Event
A unit begins casting an ability.
Condition
Ability being cast is equal to Delete last Farm
Action
Pick Every unit in Deletelastfarm and Remove from game.

I couldn't think of anything else.. Any help please?

 

[HydraRancher]

can you explain what "delete last farm" is supposed to do?

 

[ShadowInTheD]

Micro, Try this.

Do an event that fires when they build a farm.

Actions:
Set Farm = 0
Set last created unit = Farm + 1
You'll need a loop from like 1 - Farm
Then make it remove Farm[<Highest Number>]
Then Set Farm = Farm - 1
End loop

Edit: I don't know how effective this is, nor do I know if it even works... But it should be something like this.

Edit 2: I kind of mixed two triggers together ><. The actual removal of the farms is in another trigger, where the farm is summoned?