Over Capacity is a Normal 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, Over Capacity is Unlimited.
YGOPRODeck lists Over Capacity for these formats: Duel Links, TCG, OCG, Master Duel.
A listed print of Over Capacity appears in Order of Chaos (ORCS-EN077) at Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Over Capacity is about $0.12 on TCGPlayer (prices change frequently).
