Goblin Hero!!

I have been thinking now for a while of new heros. I was thinking about the wizard prince but I think it would be to OP. So then I thought about the goblin Lord, it would be an enemy in the single player campaign. The only way to get the "Goblin Lord" is you would have to complete the single player campaign and at the end you would be able to get him and he would be just the ach and barb heros except he would only attack loot! This would encourage players to play the campaign and not just gem to get him. Tell me your thoughts!!