Mask Charge 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, Mask Charge is Unlimited.
YGOPRODeck lists Mask Charge for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Mask Charge appears in HERO Strike Structure Deck (SDHS-EN021) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Mask Charge is about $0.22 on Cardmarket (prices change frequently).
