Gravity Collapse is a Counter 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, Gravity Collapse is Unlimited.
YGOPRODeck lists Gravity Collapse for these formats: Common Charity, TCG, OCG, Master Duel.
A listed print of Gravity Collapse appears in OTS Tournament Pack 13 (OP13-EN024) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Gravity Collapse is about $0.26 on Cardmarket (prices change frequently).
