Limit Goblin Land Mine

[Wasabee]

I have this Goblin Land Mine ability and I want to limit to each Goblin Sapper trained to only have 8 Goblin Land Mines. If the Goblin Sapper plants another land mine the first land mind will be destroyed. How do I limit the Land Mines?

 

[PublishedShadow]

Use Carrion Beetles as your base spell for the landmines. It does exactly what you need, just change the unit type to landmine.4

OR Dark portal, it may work also. I think Carrion Beetles requires corpses.

 

[Wasabee]

Carrion Beetles requires corpses and Dark Portal summons 3 units simultaneously.

 

[Daffa]

Can each player owns more than 1 Sapper? If so, use a Unit Indexer and create a list of index for the mines and trigger the whole mine spell.