Transmodify 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, Transmodify is Unlimited.
YGOPRODeck lists Transmodify for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Transmodify appears in 2014 Mega-Tin Mega Pack (MP14-EN106) at Secret Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Transmodify is about $0.05 on Cardmarket (prices change frequently).
