Clock Tower Prison is a Field 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, Clock Tower Prison is Unlimited.
YGOPRODeck lists Clock Tower Prison for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
Clock Tower Prison belongs to the Destiny HERO archetype—use that tag when searching for engine pieces and tech options.
A listed print of Clock Tower Prison appears in Dark Revelation Volume 4 (DR04-EN228) at Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Clock Tower Prison is about $0.17 on Cardmarket (prices change frequently).
