Side Effects? 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, Side Effects? is Unlimited.
YGOPRODeck lists Side Effects? for these formats: Common Charity, TCG, OCG, Master Duel.
A listed print of Side Effects? appears in 2016 Mega-Tin Mega Pack (MP16-EN096) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Side Effects? is about $0.18 on TCGPlayer (prices change frequently).
