Hallo-Ween! is a Normal Spell Card.
Spell Cards are usually activated from the hand on your turn unless their type gives another timing window.
On the current TCG and OCG Forbidden & Limited lists tracked here, Hallo-Ween! is Unlimited.
YGOPRODeck lists Hallo-Ween! for these formats: Common Charity, Duel Links, TCG, OCG, Master Duel.
A listed print of Hallo-Ween! appears in Supreme Darkness (SUDA-EN063) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Hallo-Ween! is about $0.05 on Cardmarket (prices change frequently).
