There Can Be Only One 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.
Ban status for There Can Be Only One: TCG Limited, OCG Limited. Confirm the latest list for your event or online format before you main it.
YGOPRODeck lists There Can Be Only One for these formats: Common Charity, TCG, OCG, Master Duel.
A listed print of There Can Be Only One appears in Duel Devastator (DUDE-EN053) at Ultra Rare rarity.
Among markets shown on this page, the lowest listed snapshot for There Can Be Only One is about $0.06 on Cardmarket (prices change frequently).
