Gravekeeper monsters are to weak to survive to show their strength. If u dont have the right cards in hand (kuriboh, etequa, curse of anubis) to keep them at bay i dont c the strength of this deck. Yes it would be strong with necrovalley and that is the point. The most likely scenario is tributing one gravekeeper for Oracle and thats only an extra 400 attack. Best fix is increase PvP LP to 6 or 8k
Turn 1 - set recruiter. Stall incoming attack with kuriboh
Turn 2 - E. Con. Eff 2: Tribute recruiter, stealing opponent's monster & bringing Oracle to hand. Tribute stolen monster for chief, reviving recruiter.
Analysis: E. Con's cost is well compensated by recruiter's +1, chief's +1, and tributing the opponent's monster, rather than allowing it to return to the opponent.