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I have seen a lot of Gravekeeper decks and seen different builds but I see what I can do to help, my knowledge of this deck is limited but I can help a little at-least.

The deck below is a control deck that can be used to counter most decks as well as keep a strong field in the face of a enemy`s who like to beat down your field. With added lock down cards and field control your only worry using destroying effects is Mecklords and divine wrath and even so the deck provides counters for them even. I love counter decks and grave keepers can be deadly lock downs.

Monster: 16
-Caius the Shadow Monarch x2 or Jinzo x2
-Gravekeeper's Spy x3
-Gravekeeper's Descendent x3
-Gravekeeper's Recruter x3
-Gravekeeper's Assailant x2
-Gravekeeper's Cannon holder x1
-Mystic Tomato x2
-DAD x1

Spells: 16
-Necrovalley x3
-Gravekeeper's Steele x3
-Royal Tribute x2
-MST x2
-Giant Trunade x1
-Monster Reborn x1
-Book of Moon x1
-Prohibition x2 ( Stop MST / Key cards for enemy )
-Dark hole x1

Traps: 8
-Rite of Spirit x2
-Dark Illusion x2
-Solom warning x2
-Trap stun x2 ( if using Jinzo this can be relapsed, for tuner or other card. )

Side deck:
-Battle of the elements x3 or x2 ( can lock down decks with without a single attribute monsters." sam`s " )
-Junzo or Caius depends on your pick in deck.
-Malevolent catastrophe x3 ( Anti macro )
-System Down x2 / or Magnetic mosquito x2 ( same effect but one monster and one spell ) ( Anti-machine )
-Black winged gale x1 ( tuner and it`s effect can be a game changer.)

Extra deck:
-Black feathered dragon x1 (anti burn decks)
-Black rose dragon x1 / 2 ( boom if needed)
-Stardust x2 ( it helps )
-Red Dragon ( kills reapers and marshmallow stall`s )
-Brinack/Breonick (what ever name it is xD) ( can keep the field under control ( if not already)+ Gravekeeper's Recruter-discard and search. [I think] )

@ The Cooking Hime

Solid Deck. Looks good. The only thing is I don't really like Cannon Holder that much. I don't really see it as effective at all. I probably would replace it with a Visionary, just because Visionary can be a hell of a beat stick around mid to end game. I would probalby choose a second Caius over Jinzo and run Trap stun. I used to have a couple of tuners in the deck, like a gale and a krebons, but they slowed down the deck and hindered the control so I took them out.

I've been playing with this deck for a while here's my list (it's pricy)

Monsters 17

Descendent x3
Commandant x3
Spy x3
Recruiter x3
guard x1
caius the shadow monarch x2
Plauge spreader zombie x1

spells 16
Necrovally x3
royal tribute x2
upstart goblin (unless you have pod) x3
dark hole x1
mst x2
Giant trunade x1
allure of darknes x1
grave keepers stele x2
enemy controller x1

traps 8
bottomless trap hole x2
tt x2
mirror force x1
solemn warnings x2
solemn judgement z1

whoops my bad I was wonder why there were to many cards >.> thanks for the heads. -note never post decks at 3am-