Discord is a Continuous Trap Card.
Trap Cards are normally Set first and can be activated on a later turn, often in response to an action.
On the current TCG and OCG Forbidden & Limited lists tracked here, Discord is Unlimited.
YGOPRODeck lists Discord for these formats: TCG, OCG, Master Duel.
A listed print of Discord appears in Ancient Prophecy (ANPR-EN068) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Discord is about $1.95 on eBay (prices change frequently).
