You’ve taken on hordes of opponents, whether it’s playing against AI or countless other players, but now it’s time to take on your toughest challenge yet… Friendship. Hop over to your friends list and click on your friend’s name. Muster your courage. It’s time to click Challenge.
When you issue a challenge, your friend needs to click Accept (or, you know, Decline if they’re not ready to face your overwhelming awesomeness, yet). While you wait, you’ll have the option to cancel your challenge, just in case you need more time to mentally prepare.
After your friend has accepted, you’ll each have the option to select your deck. This means your deck will need to be ready ahead of time, so be sure to strategize before issuing a challenge.