I think your monster set-up is stable, no fixes at all.

Magics are pretty good too, just I don't think you need two terraforming. Side deck it against M/T removal high decks. I would play heavy storm in here despite it anti-necrovalleyness.

Traps
: Call isn't needed you have rites of spirit so it is obsolete. Dust Tornado or sakertsu here

Looks fine. You have a knack for decks Nintendo the two I have seen by you are impressive. 8.8/10

Kool deck, my only suggestion is that u replace the 2 BoM for 2 Creature Swaps.

Sweet GK deck, really cant do much to it: 9.2/10

Keep the books. Chain to your own spy at end of opponent's turn if you don't need to use it for anything else, then flip for more swarmage.

Free card advantage is always good.

I strongly suggest you get protection for necrovallies, as the death of Necrovalley means your gravekeepers are stuck being 1500 weaklings with few other effects [in the case of Assailant, NO other effect].

Nintendo Man could yo reprint your updated version of the deck after all these fixes so i could give some advice, i also have a GK deck of my own that totally annihlates so i could help alot

Monsters(16)
*^=Gravekeeper's Chief=^*
*^=Gravekeeper's Spear Soilder=^*
*^=Gravekeeper's Spear Soilder=^*
*^=Gravekeeper's Spear Soilder=^*
*^=Gravekeeper's Assailant=^*
*^=Gravekeeper's Assailant=^*
*^=Gravekeeper's Assailant=^*
*^=Gravekeeper's Spy=^*
*^=Gravekeeper's Spy=^*
*^=Gravekeeper's Spy=^*
*^=Mystic Tomatoe=^*
*^=Mystic Tomatoe=^*
*^=Magical Scientist=^*
*^=Breaker the Magical Warrior=^*
*^=Tribe-Infecting Virus=^*
*^=Sinister Serpent=^*

Magic(18)
*^=Necrovalley=^*
*^=Necrovalley=^*
*^=Necrovalley=^*
*^=Terraforming=^*
*^=Smashing Ground=^*
*^=Smashing Ground=^*
*^=Book of Moon=^*
*^=Book of Moon=^*
*^=Change of Heart=^*
*^=Snatch Steal=^*
*^=Painful Choice=^*
*^=Pot of Greed=^*
*^=MST=^*
*^=Swords of Revealing Light=^*
*^=Heavy Storm=^*
*^=Premature Burial=^*
+Creature Swap
+ Card Destruction

Traps(6)
*^=Torrential Tribute=^*
*^=Ring of Destruction=^*
*^=Rite of Spirit=^*
*^=Rite of Spirit=^*
*^=Rite of Spirit=^*
*^=Call of the Haunted=^*

WEll i just play tested my gravekeeper today and premature and call work well regardless of the necrovalley effect. I like the book of moon + Spear dragon = ownage combination i would probably use Book if i had it. I added Creature Swap and Card Destruction for control give em ur sinister or a flipped spy and take their powerful monster (case specific ofcoarse), card destruction is just for speed at least that is what other people told me about my deck.

Good Deck 8.9/10

Good Luck!!!

I don't think Tomatoes are really necessary here. I'd replace them with a Nobleman of Crossout and Magic Cylinder (Probably more of a personal preference). Other than that, the deck looks great.

hey man nice deck i give it a 8.5/10
i run a gravekeepers deck as monsters go i found that having 2 chiefs help alot and 1 Tsukuyomi to flip your spys face down and that lets you leave your book of moon's of your opperents monster's and add a compulsory evacuation device or mirror wall since they are a nice suprise.

so basiclly my option is
+ gravekeepers chief
+ tsukuyomi
+magician of faith or dark magician of choas(to get a nercovally)
+compulsory evacuation device
+mirror wall
-magicial scientist
-breaker the magicial warrior(i found the it didnt help since it can be very slow)
-Creature Swap
-Torrential Tribute
-Call of the Haunted

some card might not work in your deck since everyone plays different.