Reinforcement of the Army's Troops 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, Reinforcement of the Army's Troops is Unlimited.
YGOPRODeck lists Reinforcement of the Army's Troops for these formats: Common Charity, TCG, OCG, Master Duel.
A listed print of Reinforcement of the Army's Troops appears in 2022 Tin of the Pharaoh's Gods (MP22-EN051) at Ultra Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Reinforcement of the Army's Troops is about $0.02 on Cardmarket (prices change frequently).
