Enemy Controller is a Quick-Play 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, Enemy Controller is Unlimited.
YGOPRODeck lists Enemy Controller for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, Speed Duel, TCG, OCG, Master Duel.
A listed print of Enemy Controller appears in 25th Anniversary Rarity Collection II (RA02-EN051) at Collector's Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Enemy Controller is about $0.07 on TCGPlayer (prices change frequently).
