Triangle Power 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, Triangle Power is Unlimited.
YGOPRODeck lists Triangle Power for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Triangle Power appears in Ancient Sanctuary (AST-098) at Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Triangle Power is about $0.10 on Cardmarket (prices change frequently).
