Twilight Guardian is a epic neutral minion card that belongs to the "The Grand Tourney" set, which was released on 24.08.2015 and is one of initially 132 cards. The artist of this card was Slawomir Maniak, who also made 99 other artworks for Hearthstone.
The card costs 4 mana, has 2 attack and 6 health, and its card text reads: "Battlecry: If you're holding a Dragon, gain +1 Attack and Taunt."
The flavor text of the card is the following: A result of magical experiments carried out by the Black Dragonflight, it's not his fault that he's a vicious killer.
Based on 111 quiz answers, the card is moderately hard to memorize: 88.29% of them were correct.