Tri-Wight 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, Tri-Wight is Unlimited.
YGOPRODeck lists Tri-Wight for these formats: Duel Links, Speed Duel, Common Charity, TCG, OCG, Master Duel.
A listed print of Tri-Wight appears in OTS Tournament Pack 15 (OP15-EN018) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Tri-Wight is about $0.20 on Cardmarket (prices change frequently).
