Smile Potion is a Normal 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, Smile Potion is Unlimited.
YGOPRODeck lists Smile Potion for these formats: Common Charity, TCG, OCG, Master Duel.
A listed print of Smile Potion appears in 25th Anniversary Tin: Dueling Heroes Mega Pack (MP23-EN057) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Smile Potion is about $0.06 on TCGPlayer (prices change frequently).
