Forum:Usefulness of Necrovalley

I knew that this field spell card Necrovalley can negate the spell, trap and monster effect that target the graveyard.  1) Can Necrovalley negate a spell card that can't be negated which targets the graveyard?(Incase)  2) What kind of deck that mainly blocked by Necrovalley's effect?  Tanhopkins93 10:16, 27 April 2008 (UTC)Tanhopkins93(Newbie)