Effect
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".
The monster effect "When this card is flipped face-up: You can target 1 card in your opponent's GY; shuffle it into the Deck" is a Trigger Effect. (It targets 1 card in your opponent's GY.)
The monster effect "You can target 1 card in your opponent's GY; shuffle it into the Deck" is an optional effect that can be activated when "Gravekeeper's Ambusher" itself is flipped face-up. (It can also be activated during the Damage Step.)
The monster effect "If this flipped card is sent to the GY: You can target 1 'Necrovalley' card in your GY; add it to your hand" is a Trigger Effect that activates in the GY. (It targets 1 "Necrovalley" card in your GY.)
The monster effect "You can add it to your hand" is an optional effect that can be activated when the flipped "Gravekeeper's Ambusher" itself is sent to the GY. (It can also be activated during the Damage Step.)
The monster effect "You can add it to your hand" is not negated, nor does its resolution fail, even if the effect of "Necrovalley" is being applied.
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