Theft is something I'd like to try, but I couldn't find enough good theft effects. Most of the good ones are Planeswalkers, which I've included in a different threatboard. I might make another stab at it.
Extra combat is a good idea. I'll see what I can do in that regard.
For top-deck manipulation, I think I would rather just integrate it into the main deck. It would be a useful addition to all strategies.