Cards in graveyards can't be the targets of spells or abilities.
, : Exile Silent Gravestone and all cards from all graveyards. Draw a card.
1/19/2018 Only spells and abilities that target cards in graveyards will be affected. Spells and abilities that affect cards in graveyards without targeting them (such as Extract from Darkness) can still affect those cards.
1/19/2018 Silent Gravestone isn’t exiled until its activated ability resolves.