This deck works exactly like normal T.G Stun does, but with a more control aspect to it. Necrovalley combined with Skill drain hinders a lot of decks.
The reason why Gravekeeper's are sided is because my opponent usually sides out cards like Effect Veiler, Forbidden Chalice and Fiendish Chain because they are extreme dead draws against T.G Stun, and this allows me to side out all of my T.G and T.G related cards (Barb, Skill Drain, Horn) and to side in my Gravekeeper's without worrying about my opponent countering them.