Pendulum Paradox 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, Pendulum Paradox is Unlimited.
YGOPRODeck lists Pendulum Paradox for these formats: Duel Links, TCG, OCG, Master Duel.
Pendulum Paradox belongs to the Magician archetype—use that tag when searching for engine pieces and tech options.
A listed print of Pendulum Paradox appears in 2018 Mega-Tin Mega Pack (MP18-EN209) at Secret Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Pendulum Paradox is about $0.27 on TCGPlayer (prices change frequently).
