Soul Drain is a Continuous Trap Card.
Trap Cards are normally Set first and can be activated on a later turn, often in response to an action.
On the current TCG and OCG Forbidden & Limited lists tracked here, Soul Drain is Unlimited.
YGOPRODeck lists Soul Drain for these formats: Common Charity, TCG, OCG, Master Duel.
A listed print of Soul Drain appears in Astral Pack Four (AP04-EN013) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Soul Drain is about $3.85 on TCGPlayer (prices change frequently).
