Wild — is a special card that allows you to get another unopened card.
Tap on the Albums → “W” icon in the lower part of the screen and choose the card you wish to unlock.
You can unlock a card with the same rarity shown on the back of the Wild or lower.
Wild can be gained:
— as a reward for duplicate cards,
— within the promotions.
— as a reward in the purchased Event Pass, yet this feature is currently in test and may not be available.
Every Wild card has a duration. It can be checked in the Albums tab.