Rock Bombardment 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, Rock Bombardment is Unlimited.
YGOPRODeck lists Rock Bombardment for these formats: GOAT, OCG GOAT, Duel Links, Speed Duel, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Rock Bombardment appears in Dark Revelation Volume 3 (DR3-EN235) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Rock Bombardment is about $0.08 on Cardmarket (prices change frequently).
