Mine - Exploding Ability

Can this ability be made to only occur for specific classes of units such as organic?

cant you just use a dummy autocast ability that targets enemy organics and then trigger the effects?

Well, the explosion(something like "AOE death effect"?) IS an ability. You could try to edit that and change the "Targets Allowed" field, right?

Stats - Targets Allowed = Organic

Go to the Object Editor and then go to Abilities, look for the ability "Item Place Goblin Land Mine" and look for Stats - Targets Allowed then modify it to: Stats - Targets Allowed = Organic
And that's how you do it!