Level Retuner 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, Level Retuner is Unlimited.
YGOPRODeck lists Level Retuner for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Level Retuner appears in Duelist Pack Collection Tin 2009 (RGBT-ENPP6) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Level Retuner is about $0.02 on Cardmarket (prices change frequently).
