New Card Type
The set features a new library card type. Rules for that card type are printed on each booster wrapper. While the promo card would be legal for V:EKN play earlier, the rules for playing the card won't go into effect until the set as a whole is legal. So the card is effectively legal only when the set is (30 days after the official retail release date for V:EKN constructed tournaments).
More information on the new card type will follow under a later preview.