Black Magic Ritual is a Ritual 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, Black Magic Ritual is Unlimited.
YGOPRODeck lists Black Magic Ritual for these formats: OCG GOAT, Duel Links, Speed Duel, Common Charity, Edison, TCG, OCG, Master Duel.
Black Magic Ritual belongs to the Dark Magician archetype—use that tag when searching for engine pieces and tech options.
A listed print of Black Magic Ritual appears in Legendary Collection 3: Yugi's World Mega Pack (LCYW-EN078) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Black Magic Ritual is about $0.09 on Cardmarket (prices change frequently).
