You can request cards from your teammates. Any Silver card can be requested.

Here's how:

• In the team chat window, tap on the Request button with the card icon
• In the window that opens, choose the desired card
• Confirm the actions by pressing the button at the bottom of the window

Your request will appear in the team chat, and if one of your teammates has a duplicate of the card you want, they will be able to share it with you.

Please note:

• Since Gold cards are not exchangeable, you can't request such cards.
• In the team chat, only players who have a duplicate of the card will see your request.
• You can request only 1 card within one day.
• If you aren't part of a team yet, check this article on how to join a team.