Top Share 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, Top Share is Unlimited.
YGOPRODeck lists Top Share for these formats: Common Charity, TCG, OCG, Master Duel.
A listed print of Top Share appears in Battle of Chaos (BACH-EN064) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Top Share is about $0.09 on TCGPlayer (prices change frequently).
