Skull Dice 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, Skull Dice is Unlimited.
YGOPRODeck lists Skull Dice for these formats: GOAT, Speed Duel, OCG GOAT, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Skull Dice appears in Event Pack Speed Duel (EVSD-EN004) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Skull Dice is about $0.14 on Cardmarket (prices change frequently).
