Security Block is a Quick-Play 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, Security Block is Unlimited.
YGOPRODeck lists Security Block for these formats: Common Charity, TCG, OCG, Master Duel.
A listed print of Security Block appears in 2018 Mega-Tin Mega Pack (MP18-EN136) at Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Security Block is about $0.05 on Cardmarket (prices change frequently).
