Darkworld Shackles is a Equip 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, Darkworld Shackles is Unlimited.
YGOPRODeck lists Darkworld Shackles for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Darkworld Shackles appears in Battle Pack: Epic Dawn (BP01-EN083) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Darkworld Shackles is about $0.11 on Cardmarket (prices change frequently).
