Forum:Defense deck tips?

I made this using only the cards I own. I would make a much better deck on Dueling Network, but this is my real-life, format-based deck. Many umderrated and underused cards, so if you think I should replace them with some overused staple cards, give a very good explanation, and give thought to how I can use my already in-place cards effectively. And the only 2 cards I won't take out are Spirit Barrier and Astral Barrier, cuz those 2 together make an awesome, powerful, and trolling combo c;

thanks :)