Leeching the Light 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, Leeching the Light is Unlimited.
YGOPRODeck lists Leeching the Light for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Leeching the Light appears in The Shining Darkness (TSHD-EN061) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Leeching the Light is about $0.25 on Amazon (prices change frequently).
