A few GK Cards I'm proposing.

GK Support [+]

Name: Gravekeeper's Ghoul
Level/rank: 3
Attribute: Dark
Monster Type(s): Spellcaster
Effect: Cannot be destroyed by battle. When an opponent's monster declares a direct attack while this card is in your Graveyard while "Necrovalley" is on the field: You can Special Summon this card from your Graveyard in face-up Attack Position, and if you do add 1 "Gravekeeper's" Monster from your graveyard to your hand. This effect cannot be negated by the effect of "Necrovalley".
ATK/DEF 0/0

Name: The Ancient Pharaoh
Level/rank: 12
Attribute: Dark
Monster Type(s): Spellcaster
Effect: (This card is always treated as a "Gravekeeper's" card) Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand or Graveyard) by having 4 or more "Gravekeeper's" monsters with different names in your Graveyard while "Necrovalley" is on the field. Face-up Field Spell Cards cannot be destroyed by effects. Neither player can activate a new Field Spell Card. This card gains 500 ATK and DEF for each "Gravekeeper's" monster in your Graveyard with different names. Once per turn, during either player's turn: Target 1 "Gravekeeper's" Monster in you graveyard; until the End Phase, this card gains that monster's effects. You must control this face-up card to activate and to resolve this effect. During your Opponent's End Phase: Destroy this card.
ATK/DEF 100/100

Name: Sacred Ankh of Necrovalley
Trap type: Continuous
Effect: Activate only if "Necrovalley" is on the field. Once per turn, when either a "Gravekeeper's" monster or "Necrovalley" leaves the field due to an opponent's card effect: Add 1 "Necrovalley" or "Gravekeeper's" monster from your graveyard to your hand. This effect cannot be negated by the effect of "Necrovalley". Destroy this card at your third End Phase after activation.

Name: Endless Sands of Necrovalley
Spell type: Quick-play
Effect: Activate only if "Necrovalley" is on the field. Target 1 card your opponent controls, shuffle this card this card back into the deck, and if you do shuffle the target into back into your opponent's deck. You can only activate 1 "Endless Sands of Necrovalley" per turn.

<Snipped quote by The Grey Dust>

NO NO NO NO NO NO NO NO AND NO

In other news Tests are nearly done (one more day)
But for now, Endless sands is broken as it doesn't get discarded (ha take 3 best removal)

Sacred Ankh seems okayish

If Pharoah has Yami yugi as its monster then it am okay with it

no clue bout that GHOUL.

@The Grey Dust Ghoul's way too good of a wall while Necrovalley is out. Maybe reduce the graveyard summon effect to once per duel, because otherwise you literally can't get over that card if Necrovalley doesn't get dealt with... And if you're smart, you basically have six copies of it in your deck (Terraforming).

Scratch that, nine necrovalleys with that new card =P. All other card 'cept ghoul seem fine to me, though hourglass is definitely being limited to two if I do let it through.