Silent Gravestone
Artifact
Cards in graveyards can't be the targets of spells or abilities.
, 
: Exile this artifact and all cards from all graveyards. Draw a card.
Made to ward off the Grim Captain and silence the lure of undeath.
Suzanne Helmigh
Rivals of Ixalan Promos (PRIX)
• #182sRulings
Silent Gravestone isn’t exiled until its activated ability resolves.
(wotc • 2018-01-19)
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.
(wotc • 2018-01-19)
Rulings
Silent Gravestone isn’t exiled until its activated ability resolves.
(wotc • 2018-01-19)
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.
(wotc • 2018-01-19)