The Release Event set for OP-12 contains only the 75 common and uncommon cards from the full OP-12 Legacy of the Master set. Every card has a Release stamp but features the same art as the main release.
Each Release Event pack contains two random cards. Every participant in the OP-12 Release Event was given one pack. The packs were available from August 15, 2025 with the main set releasing on August 22, 2025.