Keeper of the Grove is a Druid minion card (rarity: rare) that belongs to the "Legacy" set. The artist of this card was Gabor Szikszai, who also made 26 other artworks for Hearthstone.
The card costs 4 mana, has 2 attack and 4 health, and its card text reads: "Choose One - Deal 2 damage; or Silence a minion."
The flavor text of the card is the following: These guys just show up and start Keeping your Groves without even asking.
Based on 128 quiz answers, the card is easy to memorize: 94% of them were correct. The question on “Attack” is answered correctly most often (100%), the one on “Health” least often (88%). An answer takes 5.8 seconds on average.