Mind Pollutant 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, Mind Pollutant is Unlimited.
YGOPRODeck lists Mind Pollutant for these formats: TCG, OCG, Master Duel.
A listed print of Mind Pollutant appears in Abyss Rising (ABYR-EN064) at Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Mind Pollutant is about $0.09 on Cardmarket (prices change frequently).
