Gravekeepers are an archetype with excellent synergy and effects. While this archetype is still powerful, it has been powercrept so much that until new Gravekeeper support is released, it requires non-archetype support cards to remain competitive. Silent Magician is powerful and fits well in this deck. The ability of Gravekeeper's Recruiter to replenish your lost resource and thin your deck after using him as tribute fodder for Silent Magician is extremely useful.
We currently do not have enough statistics on this deck to generate a breakdown. See below for recent decklists.
Oracle's effect can easily allow you to turn the board back in your favor. One combo is: Tributing a Gravekeeper's Chief with Recruiter, using Chief to get back a Recruiter, search an Oracle, use Arrivalrivals to tribute Recruiter for Oracle and either destroy all Set Monsters or reduce the Attack of opponent Monsters by 2000.
In the current meta, Hey, Trunade! is great to go for the quick OTK or establish a solid board. Cosmic Cyclone is a good replacement depending on what you are facing. Against Fur Hires, Trunade is better, facing more Amazoness, Cyclone is better. It is important to know that you may need to adapt your deck to what you are facing during your climb.
Gravekeeper's Visionary is a very powerful card however, the fact that he cannot be searched by Recruiter has kept him from being a staple in GK decks.