When Gravekeeper’s Recruiter is sent from your side of the field to the Graveyard, you get to add a “Gravekeeper’s” monster with 1500 or less DEF from your Deck to your hand. Gravekeeper’s Recruiter can essentially search any “Gravekeeper’s” monster in the game, with the exception of Gravekeeper's Visionary, it keeps everything consistent and it helps maintaining card advantage.
Gravekeeper’s Priestess is your other Normal Summon, a Level 3 monster that increases the ATK and DEF of all “Gravekeeper’s” by 200. With Priestess and Necrovalley on the field, your Gravekeeper's Recruiter will reach 1900 ATK and 2200 DEF, which is pretty impressive for a Level 3.
Keep in mind that Priestess’ effect will affect all “Gravekeeper’s” on the field, including the ones your opponent controls. Depending on what will happen after the introduction of Necrovalley, this detail might become more relevant.
Gravekeeper’s Chief is a Level 5 monster that, when Tribute Summoned, allows you to Special Summon a “Gravekeeper’s” monster from your Graveyard. You can Summon Gravekeeper’s Chief during the Battle Phase with Arrivalrivals by Tributing Gravekeeper’s Recruiter or Gravekeeper's Priestess and then Special Summon them back right away.
You can also use Double Summon or Soul Exchange to get Gravekeeper’s Chief on the field without having to wait for an entire turn.
Gravekeeper’s Oracle is a Level 10 monster that can be Summoned by Tributing 3 monsters or just 1 “Gravekeeper’s” monster. Depending on how many “Gravekeeper’s” monsters you Tributed to Summon Gravekeeper’s Oracle, you get to activate up to three different effects:
With the first effect Gravekeeper’s Oracle will simply gain ATK equal to the combined Level of the Tributed monsters x100, which can definitely be useful in certain situations;
The second effect allows you to destroy all Set monsters on your opponent’s side of the field. This effect is particularly strong against decks that like to use cards such as Snowman Eater and D.D. Assailant;
The third effect will reduce the ATK and DEF of all face-up monsters on your opponent’s side of the field by 2000.
Just like with Chief, you can Summon Gravekeeper’s Oracle during the Battle Phase using Arrivalrivals: a great way of responding to a Wall of Disruption.
Necrovalley increases the ATK and DEF of all “Gravekeeper’s” monsters by 500, it prevents cards from being banished from the Graveyard and it negates any card effect that would move a card in the Graveyard to a different place.
These are just some of the things this card does, I listed what I believed to be the most relevant. Some of your own card effects can be prevented by this Field Spell, but, if Gravekeeper’s Chief is face-up on your side of the field, you have nothing to worry about.
It’s unfortunate we can’t search this Field Spell as easily as we can with most “Gravekeeper’s” monsters.
Restart Can be used only once after starting hands are dealt. Reveal and redraw your starting hand. Your first Draw will be skipped if you use this Skill.
It’s really important to start with Gravekeeper’s Recruiter: even if you don’t find Necrovalley in your hand, thanks to this Level 3 monster, you are going to quickly thin your Deck and eventually draw into it.
This deck struggles with backrow, it has no natural answer to it, but, at the same time, there’s not really that much space left for something like Hey, Trunade!. Blizzard Princess seems like a decent answer to this problem.