Spreading Plague is a Druid spell card (rarity: rare) that belongs to the "Knights of the Frozen Throne" set, which was released on 10.08.2017 and is one of initially 135 cards. The artist of this card was Alexander Alexandrov, who also made 11 other artworks for Hearthstone.
The card costs 6 mana and its card text reads: "Summon a 1/5 Scarab with Taunt. If your opponent has more minions, cast this again."
The flavor text of the card is the following: In the past, plagues were spread by mice or fleas. These days they're spread by elves.
Based on 111 quiz answers, the card is easy to memorize: 97% of them were correct. The question on “Name” is answered correctly most often (100%), the one on “Cost” least often (93%). An answer takes 7.3 seconds on average.