Card backs and boards from the Cosmetics shop can now be set for each deck. Open Decks and tap the small card back in the corner of a deck. Choose Default to use what you equipped in the shop, Standard for the original look, or any card back and board you own.
During a match you see your deck’s board, and both players see each other’s card backs: on the draw pile, in the opponent’s hand and on face-down Shardlings before the first turn.