Unexpected Dai 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, Unexpected Dai is Unlimited.
YGOPRODeck lists Unexpected Dai for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Unexpected Dai appears in Crossed Souls (CROS-EN065) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Unexpected Dai is about $0.15 on Cardmarket (prices change frequently).
