Duel! is a Paladin spell card (rarity: epic) that belongs to the "Rise of Shadows" set, which was released on 09.04.2019 and is one of initially 136 cards. The artist of this card was Konstantin Turovec, who also made 143 other artworks for Hearthstone.
The card costs 5 mana and its card text reads: "Summon a minion from each player's deck. They fight!"
The flavor text of the card is the following: If you don’t fight to the death, it’s Duel Yielding.
Based on 73 quiz answers, the card is easy to memorize: 93% of them were correct. The question on “Name” is answered correctly most often (100%), the one on “Cost” least often (86%). An answer takes 7.1 seconds on average.