Paralyzing Potion 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, Paralyzing Potion is Unlimited.
YGOPRODeck lists Paralyzing Potion for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Paralyzing Potion appears in Metal Raiders (MRD-137) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Paralyzing Potion is about $0.09 on Cardmarket (prices change frequently).
