Mustering of the Dark Scorpions 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, Mustering of the Dark Scorpions is Unlimited.
YGOPRODeck lists Mustering of the Dark Scorpions for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
Mustering of the Dark Scorpions belongs to the Dark Scorpion archetype—use that tag when searching for engine pieces and tech options.
A listed print of Mustering of the Dark Scorpions appears in Dark Crisis (DCR-093) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Mustering of the Dark Scorpions is about $0.09 on TCGPlayer (prices change frequently).
