Power Filter 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, Power Filter is Unlimited.
YGOPRODeck lists Power Filter for these formats: Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Power Filter appears in OTS Tournament Pack 16 (OP16-EN018) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Power Filter is about $0.82 on Cardmarket (prices change frequently).
