Hieratic Seal of Convocation 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, Hieratic Seal of Convocation is Unlimited.
YGOPRODeck lists Hieratic Seal of Convocation for these formats: Duel Links, TCG, OCG, Master Duel.
Hieratic Seal of Convocation belongs to the Hieratic archetype—use that tag when searching for engine pieces and tech options.
A listed print of Hieratic Seal of Convocation appears in Galactic Overlord (GAOV-EN056) at Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Hieratic Seal of Convocation is about $0.24 on TCGPlayer (prices change frequently).
