Hidden Oasis is a rare Druid spell card that belongs to the "Saviors of Uldum" set, which was released on 06.08.2019 and is one of initially 135 cards. The artist of this card was Zoltan Boros, who also made 247 other artworks for Hearthstone.
The flavor text of the card is the following: Amazing that it's been hidden, given the twenty-foot treant splashing around in it.
The card is easy to memorize with 96.51% of correct quiz questions.
