Counter Gem 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, Counter Gem is Unlimited.
YGOPRODeck lists Counter Gem for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
Counter Gem belongs to the Crystal Beast archetype—use that tag when searching for engine pieces and tech options.
A listed print of Counter Gem appears in Duelist Pack: Jesse Anderson (DP07-EN024) at Ultra Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Counter Gem is about $0.08 on Cardmarket (prices change frequently).
