It's decent, but there are better combos out there. I'm going to edit this later with a picture of my current Wall-Knight deck build (my phone takes forever to email photos 😞 ) and describe some parts of it to give you some ideas for what works well with Wall-Knight. He's an awesome hero, and has strategies aplenty, so trust me when I say you'll have fun with him.
You can also check out this stellar site for deck-building tips: http://pvzheroesdecks.com/
