Knight's Title is a Normal 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, Knight's Title is Unlimited.
YGOPRODeck lists Knight's Title for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
Knight's Title belongs to the Dark Magician archetype—use that tag when searching for engine pieces and tech options.
A listed print of Knight's Title appears in Legendary Collection 3: Yugi's World Mega Pack (LCYW-EN072) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Knight's Title is about $0.63 on TCGPlayer (prices change frequently).
