Today's Daily Dare Challenge is Dueling Decks. To beat AAA you need a score of 18,000 points and to beat Abigail you need a score of 1,900 points.
Today is a Double Dare day, so you get both the AAA and Abigail prize if you beat AAA's score and accepted the Double Dare challenge. Not too hard to beat AAA at Dueling Decks, but it does take some time, especially since I accidentally won too early one round.
The prize for beating AAA is Striped Dueling Shirt (wearable). The prize for beating Abigail is Dueling Decks Mat. The prize for completing the challenge on day of release is Magic Deck.