I have studied and worked with animals for years so this is definitely my topic!
First of all, you are right about Collies and Aussie cattle dogs being highly active and can be difficult to work with. Border Collies are considered the most highly intelligent dog on the planet, and if their energy and intelligence aren’t tended to then there can be consequences.
As someone said earlier it might not be a suitable breed for your lifestyle. The size, energy and activity levels of the dog need to match yours.
I can fully understand that this dog is frustrating you, the reason he is acting this way is because he is not trained. I’m a bit iffy over dogs that don’t get trained properly, it really bugs me. I have a friend who thinks her dog is great but I can’t stand him because he jumps on me and it’s really painful, plus he never actually listens to commands when he is SUPPOSED to, i.e. when she decides to let him off a leash and he sees another dog.
Every one of these dogs behaviours can and should be fixed. It’s not fair on you and it’s not fair on the dog if he keeps doing what he does. If this dog is allowed to keep play fighting and hurting people that can lead to dominance, and with dominance comes aggression.
If you aren’t able to do it you need to take this dog to a shelter, the longer it takes the less chance this dog will have of going to a new owner.

As for the breed, does he look anything like this?-



(I was trying to picture what your dog must look like and this breed came to my head)
If he looks something like this then he is actually an Australian Shepherd (the colour is blue merle), oddly not originally from Australia but California.

If you weren’t prepared to care for this animal, If you aren’t able to take the time to train him, if you can’t afford to feed him, if he’s hurting people, and your husband is afraid of him, then I REALLY would advise taking him to a shelter, if you explain to them that someone left the dog with you then they will understand.

XxXx