Forum:Necro Valley vs. dark world deck

ok so Necrovalley states that "Negate the effects of Spell, Trap and Monster Cards that affect a card(s) in the Graveyard. Neither player can remove from play cards in the Graveyard. All "Gravekeeper's" monsters gain 500 ATK and DEF," but i check out some links and stuff but i found out that some of my sources say they still get there effects so my question is do they???

plz tell if ur a judge also.