Veil of Darkness is a Continuous 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, Veil of Darkness is Unlimited.
YGOPRODeck lists Veil of Darkness for these formats: Speed Duel, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Veil of Darkness appears in Destiny Soldiers (DESO-EN052) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Veil of Darkness is about $0.06 on Cardmarket (prices change frequently).
