TGX300 is a Continuous 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, TGX300 is Unlimited.
YGOPRODeck lists TGX300 for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
TGX300 belongs to the T.G. archetype—use that tag when searching for engine pieces and tech options.
A listed print of TGX300 appears in Extreme Victory (EXVC-EN054) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for TGX300 is about $0.04 on Cardmarket (prices change frequently).
