"
Necrovalley" will NOT negate effects that do not target a card or cards in the Graveyard. So "
Necrovalley" will NOT negate the effects of "
Dark Necrofear" (when destroyed and sent to the Graveyard), "
Revival Jam", "
Winged Sage Falcos", "
Twin-Headed Behemoth",
"Mystical Knight of Jackal", and "Red-Moon Baby".
So your theory is that
Mystical Knight of Jackal does not affect a card in the Graveyard?
I must admit it seems quite odd to me that
Penguin Knight and
Fiber Jar are "Targeting" effects (does that mean that if I chain
Mystik Wok to send my
Treeborn Frog to the Graveyard after
Fiber Jar has been flip summoned that my
Treeborn Frog won't be shuffled back into my deck because it was added after
Fiber Jar "Targeted" the contents of my Graveyard?)
Certainly something worth posting to the Judge's List.
Necrovalley itself doesn't state that it requires the card in the Graveyard to be Targeted in order to negate it, but the rulings certainly seem to state that it only prevents Targeted effects.
Aside from Penguin Knight and Fiber Jar that is.
-Edit- I do so enjoy these issues.