Gravekeeper's Ambusher (Common)

When this card is flipped face-up: You can target 1 card in your opponent's GY, place that target on the bottom of their Deck. If this card is sent from the field to the GY after being flipped face-up: You can target 1 "Necrovalley" card in your GY, add that target to your hand. These effects are unaffected by "Necrovalley".