Silent Graveyard is a Quick-Play Spell Card.
Spell Cards are usually activated from the hand on your turn unless their type gives another timing window.
On the current TCG and OCG Forbidden & Limited lists tracked here, Silent Graveyard is Unlimited.
YGOPRODeck lists Silent Graveyard for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Silent Graveyard appears in Duel Devastator (DUDE-EN042) at Ultra Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Silent Graveyard is about $0.11 on TCGPlayer (prices change frequently).
