The fix will be implemented and the restriction will be lifted at 11:00 p.m., Apr 2 (PT).
Gawain of the Round Table, a card from the Tempest of the Gods card pack, causes matches to be cancelled when played. While we work to implement a fix, this card will be unavailable on the Decks screen. It will also be unavailable in ranked, unranked, Take Two, regular private, Take Two private, main story, and practice matches. Gawain can still be drawn from the card pack.
We plan on resolving this issue in the coming days and apologize for the inconvenience caused. Thank you for your understanding.