Finite Cards 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, Finite Cards is Unlimited.
YGOPRODeck lists Finite Cards for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Finite Cards appears in 2017 Mega-Tin Mega Pack (MP17-EN037) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Finite Cards is about $0.04 on Cardmarket (prices change frequently).
