Are the origin promo cards tournament legal?

Ruling: Yes, origin promo cards are tournament legal. The cards are printed with the OGN set code (visible on the card itself), which is part of the current Standard format.

Nuances:

• The promo cards may be registered online as OGNX, but the physical card shows OGN, which is what matters for legality
• You cannot shuffle cards of different languages together, so if your promo is in a different language than the rest of your deck, it cannot be used